https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/v/scalene-isosceles-equilateral-acute-right-obtuse 2023-07-24T13:48:13.07161686Z Classifying triangles The video explores how triangles are classified based on their sides and angles. It introduces the terms scalene, isosceles, and equilateral for side lengths, and acute, right, and obtuse for angles. It emphasizes that triangles can be categorized in multiple ways based on these characteristics. Sal Khan video https://cdn.kastatic.org/googleusercontent/wmcE1ICNQ2GKhtp6LRNQ8JmJgM5inf2NFAG6LfgOiBmBCSF3BfAUk2xVCtag-1XktR-C59FTrWFhayWGscT_vDQy Classifying triangles The video explores how triangles are classified based on their sides and angles. It introduces the terms scalene, isosceles, and equilateral for side lengths, and acute, right, and obtuse for angles. It emphasizes that triangles can be categorized in multiple ways based on these characteristics. https://cdn.kastatic.org/ka-youtube-converted/D5lZ3thuEeA.mp4/D5lZ3thuEeA.mp4 360 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/v/scalene-isosceles-equilateral-from-angle 2021-06-30T20:49:33Z Classifying triangles by angles You say you can't categorize a triangle because you don't know the length of the sides. Guess what? If you know the size of the angles you can! Sal Khan video https://cdn.kastatic.org/googleusercontent/fJ0XSsqW77AbfVqQKX5qllzzpmxR7zSrqOT1yMUB-BnA2aqhu2wp63g1ugLQbX6ivpdMAKDZbOqDR_CE3xqQuLYF Classifying triangles by angles You say you can't categorize a triangle because you don't know the length of the sides. Guess what? If you know the size of the angles you can! https://cdn.kastatic.org/ka-youtube-converted/sZMezOCZr40.mp4/sZMezOCZr40.mp4 330 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/v/recog-triangles-example 2021-06-30T20:49:34Z Worked example: Classifying triangles Work through sample problems categorizing triangles as scalene, isosceles, equilateral, acute, right, or obtuse.  Sal Khan video https://cdn.kastatic.org/googleusercontent/qapQdpw8cfMHWOibEL9gEkhhXOWIvu6n8Y_-szy7PC0cbCmtzxxeOv-C7x8CAMEDejATzZedt8K1-x02sMnmiZQ Worked example: Classifying triangles Work through sample problems categorizing triangles as scalene, isosceles, equilateral, acute, right, or obtuse.  https://cdn.kastatic.org/ka-youtube-converted/NRS2ZJVVzOI.mp4/NRS2ZJVVzOI.mp4 143 Triangles and quadrilaterals https://www.khanacademy.org/math/geometry-home/triangle-properties/triangle-property-review/v/review-of-triangle-properties 2020-06-23T07:22:41Z Review of triangle properties Comparing perpendicular bisectors to angle bisectors to medians to altitudes. Sal Khan video https://cdn.kastatic.org/googleusercontent/s6RQeRvzfr7hUKV5GrUjWyjdj_KCL8ee3E7hyfGbuq2Afe6jmekZCrgVoqGpa9f4LeP3lvb6M_TKw2WGTwXBHK8p Review of triangle properties Comparing perpendicular bisectors to angle bisectors to medians to altitudes. https://cdn.kastatic.org/ka-youtube-converted/KUhdMbx5ges.mp4/KUhdMbx5ges.mp4 597 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/e/identifying-triangles-by-angles 2024-04-02T14:40:11.776966208Z Classify triangles by angles Practice identifying triangles by their angles as acute, right, or obtuse. Lindsay exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/e/recognizing-triangles 2026-03-10T04:30:37.966653692Z Classify triangles by side lengths Practice identifying triangles by their side-lengths as equilateral, isosceles, or scalene. Christopher Wobbles Seymour exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/a/types-of-triangles-review 2022-05-23T14:02:41.700601975Z Types of triangles review Review ways to classify triangles based on their sides lengths and angles.  Practice classifying triangles. article https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/imp-quadrilaterals-2/v/quadrilateral-overview 2022-11-16T04:22:43.7414897Z Intro to quadrilateral There are many different types of quadrilaterals. A quadrilateral is defined as a two-dimensional shape with four sides, four vertices, and four angles. There are two main types: concave and convex. There are also various subcategories of convex quadrilaterals, such as trapezoids, parallelograms, rectangles, rhombi, and squares. Sal Khan video https://cdn.kastatic.org/googleusercontent/y0z2Dx227KWvT4VD_hG_TqpMYbxEXxdTPRSOKVc6aeWVt99HQzi2PyCHYK-EJWubSGHfH7rO_qaoBpweufvY7mrJ Intro to quadrilateral There are many different types of quadrilaterals. A quadrilateral is defined as a two-dimensional shape with four sides, four vertices, and four angles. There are two main types: concave and convex. There are also various subcategories of convex quadrilaterals, such as trapezoids, parallelograms, rectangles, rhombi, and squares. https://cdn.kastatic.org/ka-youtube-converted/Ka82QC4QvGA.mp4/Ka82QC4QvGA.mp4 504 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-third-grade-math/quadrilaterals-3rd/imp-quadrilaterals/a/identify-quadrilaterals 2021-06-30T20:49:36Z Identifying quadrilaterals Classify quadrilaterals, including rectangles, rhombuses, and squares.  article https://www.khanacademy.org/math/cc-third-grade-math/quadrilaterals-3rd/imp-quadrilaterals/e/identify-quadrilaterals 2026-05-06T05:31:17.506778064Z Identify quadrilaterals Identify squares, rectangles, and rhombuses. Lindsay exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-geometric-shapes/v/quadrilateral-properties 2021-06-30T20:49:37Z Quadrilateral properties Learn about the properties of quadrilaterals, parallelograms, trapezoids, rhombuses, rectangles, and squares. Sal Khan video https://cdn.kastatic.org/googleusercontent/JGC4e5CKmDPc0EaGsoC76iS72j_U_G4PY5Pqha8QYVqeze74OxRmhuICMKdpz8HS_llastP2FKeGE1eDazyEHLI Quadrilateral properties Learn about the properties of quadrilaterals, parallelograms, trapezoids, rhombuses, rectangles, and squares. https://cdn.kastatic.org/ka-youtube-converted/5CeBlu260Rw.mp4/5CeBlu260Rw.mp4 307 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/imp-quadrilaterals-2/v/quadrilateral-types-exercise 2023-07-17T20:04:18.610848495Z Quadrilateral types Learn to identify quadrilaterals such as kites, trapezoids, parallelograms, rhombuses, rectangles, and squares by side length, presence of parallel sides, and angle type. Sal Khan video https://cdn.kastatic.org/googleusercontent/HUjOvmPMa3weC4ohLEbNYrz2dEK6nSP4Uh1T5bWCrghuhebQwqwRbENk8-hpBp60exi1tPolvDkkOr1U_T96F3y5FQ Quadrilateral types Learn to identify quadrilaterals such as kites, trapezoids, parallelograms, rhombuses, rectangles, and squares by side length, presence of parallel sides, and angle type. https://cdn.kastatic.org/ka-youtube-converted/wPZIa3SjPF0.mp4/wPZIa3SjPF0.mp4 169 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/imp-quadrilaterals-2/v/classifying-shapes 2022-11-16T04:22:43.7414897Z Classifying quadrilaterals There are many different relationships between the types of quadrilaterals. Parallelograms have two sets of parallel sides, rhombuses are parallelograms with equal side lengths, and squares are rhombuses with right angles. Though there is overlap, not all quadrilaterals fit into each category. Sal Khan video https://cdn.kastatic.org/googleusercontent/40hO7h2wXw0eS682Y7Paa9uKYSBi0fv_ETPyiO0LA7kAJCT2W5WpF2dZUSnhJOxa7OLWNBha76KeszuEQxxjBwU Classifying quadrilaterals There are many different relationships between the types of quadrilaterals. Parallelograms have two sets of parallel sides, rhombuses are parallelograms with equal side lengths, and squares are rhombuses with right angles. Though there is overlap, not all quadrilaterals fit into each category. https://cdn.kastatic.org/ka-youtube-converted/1pHhMX0_4Bw.mp4/1pHhMX0_4Bw.mp4 148 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/imp-quadrilaterals-2/v/kites-as-a-mathematical-shape 2023-07-24T13:48:13.07161686Z Kites as a geometric shape The video dives into the world of quadrilaterals, specifically focusing on kites. It explores how kites are defined by two pairs of adjacent, congruent sides. It also highlights that the diagonals of a kite intersect at a 90-degree angle, with one line bisecting the other. Sal Khan video https://cdn.kastatic.org/googleusercontent/RZfl6I2JCE3nDSHhAEemtVwpEEpORWGNr4oUzMOoC3eirsih-ik2UXdWFKC9i_TQ_J8KAxAZbWMeQA5uYwJVYOE Kites as a geometric shape The video dives into the world of quadrilaterals, specifically focusing on kites. It explores how kites are defined by two pairs of adjacent, congruent sides. It also highlights that the diagonals of a kite intersect at a 90-degree angle, with one line bisecting the other. https://cdn.kastatic.org/ka-youtube-converted/inlMrf2d-k4.mp4/inlMrf2d-k4.mp4 338 Triangles and quadrilaterals https://www.khanacademy.org/math/cc-third-grade-math/quadrilaterals-3rd/imp-quadrilaterals/e/categorize-quadrilaterals 2025-02-27T11:46:16.621461116Z Analyze quadrilaterals Classify and compare rectangles, rhombuses, and squares. Erin Kats exercise https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/imp-quadrilaterals-2/e/quadrilateral_types 2025-02-27T11:46:16.621461116Z Quadrilateral types Identify quadrilaterals based on pictures or attributes. Quadrilaterals included are parallelograms, rhombuses, rectangles, and squares. Christopher Wobbles Seymour exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-geometric-shapes/a/quadrilaterals-review 2021-06-30T20:49:30Z Quadrilaterals review Review the following quadrilaterals: parallelogram, trapezoid, rhombus, rectangle, and square.  Then, try some practice problems. article