https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/v/complementary-and-supplementary-angles 2021-07-02T09:35:33Z Complementary & supplementary angles Learn about complementary and supplementary angles, as well as the definitions of adjacent and straight angles. Sal Khan video https://cdn.kastatic.org/googleusercontent/qDVRlJF769umQwhK0k5Gws2kWYPwSZplfCVSDfogMTaAgwYWW_U-6rLm70oo6ChLWcrKMyh4Np5FI6xpBfkMBSDydw Complementary & supplementary angles Learn about complementary and supplementary angles, as well as the definitions of adjacent and straight angles. https://cdn.kastatic.org/ka-youtube-converted/BTnAlNSgNsY.mp4/BTnAlNSgNsY.mp4 511 Angles and polygons https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/e/complementary_and_supplementary_angles 2025-02-06T19:34:52.815179935Z Complementary and supplementary angles (visual) Use your knowledge about complementary and supplementary angles to find missing angles. Marcia Lee exercise 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 Angles and polygons 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 Angles and polygons https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-triangles/e/classify-triangles-by-both-sides-and-angles 2026-04-30T20:20:55.724408584Z Classify triangles by both sides and angles Practice cross-classifying triangles by both their sides and angles.  Vicki exercise 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 Angles and polygons https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/properties-shapes/e/classifying-shapes 2026-05-01T18:40:51.669398128Z Classifying shapes Practice classifying shapes and determining which categories and subcategories each shape belongs to. Kami Soltesz exercise https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/properties-shapes/e/properties-of-shapes 2026-05-01T18:40:51.669398128Z Properties of shapes Identify and compare shapes based on their attributes.  Shapes include triangle types, quadrilateral types, pentagons, and hexagons. jenoverholt exercise https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/properties-shapes/a/polygons-review 2021-06-30T20:49:35Z Polygons review Review the term polygon and name polygons with up to 8 sides.  Then, try some practice problems. article https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/properties-shapes/a/properties-of-shapes-faq 2023-01-05T00:07:57.536591542Z Properties of shapes: FAQ Frequently asked questions about the properties of shapes. article https://www.khanacademy.org/math/geometry-home/geometry-shapes/angles-with-polygons/v/sum-of-the-exterior-angles-of-convex-polygon 2023-05-12T21:01:01.897246564Z Sum of the exterior angles of a polygon Learn a simple and elegant way to find the sum of the exterior angles of any convex polygon. You will see how to redraw the angles adjacent to each other and form a circle. Then you will discover that the sum of the exterior angles is always 360 degrees. Watch this video to master this important skill in geometry. Sal Khan video https://cdn.kastatic.org/googleusercontent/UC5fok88ogGOHxPgpquz_lcohc8q7cIY62SWTfzzJQATMpf7mmAbqUGP8cAnBW4xbNhV7LmbjdYqHsqz0heaI7kf Sum of the exterior angles of a polygon Learn a simple and elegant way to find the sum of the exterior angles of any convex polygon. You will see how to redraw the angles adjacent to each other and form a circle. Then you will discover that the sum of the exterior angles is always 360 degrees. Watch this video to master this important skill in geometry. https://cdn.kastatic.org/ka-youtube-converted/W9B3VYdC5T8.mp4/W9B3VYdC5T8.mp4 324 Angles and polygons https://www.khanacademy.org/math/7th-grade-matatag/x065dcf1640354e81:1st-quarter/x065dcf1640354e81:angles/e/regular-polygons-formulae-8th 2025-02-18T07:52:09.551150445Z Interior and exterior angles of a polygon Regular polygons Formulae supriya exercise