https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-perimeter/v/perimeter-and-area-basics 2023-05-12T21:01:01.897246564Z Perimeter & area Perimeter is the distance around the outside of a shape. For example, if you walk around the edge of a playground, you're measuring its perimeter. Area is the amount of space inside a shape. For example, if you want to put new tiles on your kitchen floor, you need to know the area of the room to know how many tiles to buy. Sal Khan video https://cdn.kastatic.org/googleusercontent/6PHejb3nLknlESjEf8yilpF588ztG96Md4U0G0F2kXYTFr7K_5SyjKX3almyy55tUq_uVPO_kJCJ4NRCR1Y_SIUy Perimeter & area Perimeter is the distance around the outside of a shape. For example, if you walk around the edge of a playground, you're measuring its perimeter. Area is the amount of space inside a shape. For example, if you want to put new tiles on your kitchen floor, you need to know the area of the room to know how many tiles to buy. https://cdn.kastatic.org/ka-youtube-converted/LoaBd-sPzkU.mp4/LoaBd-sPzkU.mp4 505 Mensuration https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-perimeter/e/perimeter-2 2025-02-10T05:04:39.155459793Z Find perimeter when given side lengths Find perimeter of figures when given an image or context.   Lindsay Spears exercise https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry/imp-multiply-to-find-area/e/area-of-squares-and-rectangles 2025-09-13T00:00:42.547282073Z Area of rectangles Find area of rectangles and squares by multiplying side lengths. Lindsay exercise https://www.khanacademy.org/math/7th-grade-math-eureka-squared-aligned/x314834f71a55c568:geometry/x314834f71a55c568:the-outside-of-a-circle/v/relating-diameter-and-circumference 2024-03-20T22:28:11.339750956Z Relating diameter and circumference Write algebraic expressions relating pi and the different parts of a circle. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/e6f5a49b-b217-460c-a079-d3ce1e70bb7c_1280_720_base.png Relating diameter and circumference Write algebraic expressions relating pi and the different parts of a circle. https://cdn.kastatic.org/ka-youtube-converted/s2vnzKp3EPQ.mp4/s2vnzKp3EPQ.mp4 432 Mensuration https://www.khanacademy.org/math/7th-grade-math-eureka-squared-aligned/x314834f71a55c568:geometry/x314834f71a55c568:the-outside-of-a-circle/e/pi-diameter-circumference 2024-03-20T22:28:11.339750956Z Relate diameter and circumference Describe π as the ratio of the circumference of a circle to its diameter. Describe the diameter and circumference in terms of π and each other. Charlie Auen exercise https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circumference/v/finding-radius-and-diameter-from-circumference 2022-10-06T11:16:59.256015857Z Radius & diameter from circumference Sal finds the radius and diameter of a circle given the circumference. video https://cdn.kastatic.org/ka_thumbnails_cache/812dd235-329d-4612-981f-073c8201c543_1280_720_base.png Radius & diameter from circumference Sal finds the radius and diameter of a circle given the circumference. https://cdn.kastatic.org/ka-youtube-converted/yWGeFDXgQvg.mp4/yWGeFDXgQvg.mp4 216 Mensuration https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circumference/e/find-the-radius-or-diameter-of-a-circle-from-the-circumference-or-area 2025-02-10T05:04:39.155459793Z Circumference of a circle Find the circumference of a circle when given either the radius or diameter.  Find the radius or diameter of a circle when given the circumference.   . exercise https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-parallelogram-area/v/intuition-for-area-of-a-parallelogram 2023-06-30T00:54:25.287354524Z Area of a parallelogram Discover the magic of geometry! The area of a rectangle and a parallelogram can be calculated in the same way. Just multiply the base by the height! This simple trick works because a parallelogram can be rearranged into a rectangle. Geometry is full of surprises! video https://cdn.kastatic.org/googleusercontent/obiKP_sTiYrTr2fcbjLKQd_D2WPPutmNxH_iXMfLCXGMXZfuweYw8KyoZdldr2mQFrC5n9vLBH0H_xSehXBS4vEV Area of a parallelogram Discover the magic of geometry! The area of a rectangle and a parallelogram can be calculated in the same way. Just multiply the base by the height! This simple trick works because a parallelogram can be rearranged into a rectangle. Geometry is full of surprises! https://cdn.kastatic.org/ka-youtube-converted/hm17lVaor0Q.mp4/hm17lVaor0Q.mp4 177 Mensuration https://www.khanacademy.org/math/up-class-9-bridge/x27a9f6658c8b5c27:quadrilaterals/x27a9f6658c8b5c27:untitled-24/e/b8-area-of-parallelogram 2026-04-07T22:59:30.107127435Z Area of parallelogram Area of parallelogram ashish exercise https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-area-triangle/v/intuition-for-area-of-a-triangle 2023-06-30T00:54:25.287354524Z Area of a triangle The area of a rectangle and a parallelogram is found by multiplying the base by the height. For a triangle, the area is half of a parallelogram's, so it's calculated by multiplying the base by the height and then dividing by 2. video https://cdn.kastatic.org/googleusercontent/Fi9pR66SMMyijKzoyFIw6a2cHjUub-HncPLAlfT0a90llRBEciMFgGmv-CAlSSHoRNi9iIgUuqiBYzHBnwv9yt4 Area of a triangle The area of a rectangle and a parallelogram is found by multiplying the base by the height. For a triangle, the area is half of a parallelogram's, so it's calculated by multiplying the base by the height and then dividing by 2. https://cdn.kastatic.org/ka-youtube-converted/rRTXKQpblEc.mp4/rRTXKQpblEc.mp4 330 Mensuration https://www.khanacademy.org/math/up-class-9-bridge/x27a9f6658c8b5c27:triangles-and-circles/x27a9f6658c8b5c27:untitled-22/e/b8-area-of-a-triangle 2026-04-07T22:59:30.107127435Z Area of a triangle Area of a triangle ashish exercise https://www.khanacademy.org/math/math-nsdc-eng/x0a43a548b892fe12:mensuration/x0a43a548b892fe12:unit-conversions/v/converting-area-units-perimeter-and-area-class-7-india-math-khan-academy 2021-07-02T09:35:33Z Converting area units Let's learn how to convert between area units like square centimetres, square metres and square kilometres. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/-CVbW9WYa9WMj30qQpL5c7XWZlPPAhynF7XL7b2-81hBoipML5BKGUIWpPadLUarMPz_Jzk4iHY7_MLPdYbWeDGZ Converting area units Let's learn how to convert between area units like square centimetres, square metres and square kilometres. https://cdn.kastatic.org/ka-youtube-converted/iDOt7HY9o0A.mp4/iDOt7HY9o0A.mp4 364 Mensuration https://www.khanacademy.org/math/math-nsdc-eng/x0a43a548b892fe12:mensuration/x0a43a548b892fe12:unit-conversions/v/hectares-as-a-unit-of-area-perimeter-and-area-class-7-india-math-khan-academy 2021-07-02T09:35:29Z Hectares as a unit of area Let's get introduced to a new unit of area called hectare and see how it is related to units like square metres. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/iR2GygGTOx3XgYehO0cuseMqBrq1u2lnqGd0Sccw-JO9Rdo6MFkr3k_O29PaXAmKNTAiSrDXUUwhhY6CgKAZdEdkLA Hectares as a unit of area Let's get introduced to a new unit of area called hectare and see how it is related to units like square metres. https://cdn.kastatic.org/ka-youtube-converted/h1j_x1-1jVU.mp4/h1j_x1-1jVU.mp4 239 Mensuration https://www.khanacademy.org/math/math-nsdc-eng/x0a43a548b892fe12:mensuration/x0a43a548b892fe12:unit-conversions/e/area-unit-conversions 2026-04-07T23:55:07.30621384Z Area unit conversions Let's practice some unit conversions involving area of simple figures. Ashish exercise https://www.khanacademy.org/math/class-7-od/x48ac5f37f7da7ee1:mensuration-odia-class-7/x48ac5f37f7da7ee1:area-odia-class-7/v/problems-on-area-between-two-rectangles-mensuration-odia-grade-7-math-khan-academy 2025-07-15T05:06:48.837653619Z Problems on area between two rectangles Struggling to find the area between two rectangles? In this video, we walk through solved problems that show you how to calculate the area of the boundary or path that surrounds a rectangle. Whether you're dealing with garden borders, tiled floors, or geometric designs, you’ll learn the step-by-step method to find the area between an outer and inner rectangle. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Problems on area between two rectangles Struggling to find the area between two rectangles? In this video, we walk through solved problems that show you how to calculate the area of the boundary or path that surrounds a rectangle. Whether you're dealing with garden borders, tiled floors, or geometric designs, you’ll learn the step-by-step method to find the area between an outer and inner rectangle. https://cdn.kastatic.org/ka-youtube-converted/qNTDX5nNDPQ.mp4/qNTDX5nNDPQ.mp4 239 Mensuration