By the end of the lesson the learner can calculate the area of rectangles, triangles, parallelograms, circles and sectors.
By the end of the lesson the learner can find the surface area of prisms and cylinders from their nets.
By the end of the lesson the learner can estimate the area of irregular shapes.
Audio narration — reads aloud, works offline
Transcript
[0:00] Area is the amount of flat surface a shape covers, measured in square units.
[0:40] A rectangle's area is length times width, and a triangle's area is half base times height.
[1:25] A circle's area is pi times the radius squared, and a sector is a fraction of that whole circle.
[2:10] The surface area of a solid is the total of all its faces, which we can see clearly from its net.
[2:55] For an irregular shape we estimate by counting whole and part squares on a grid.
Plays from this package with no internet. Subtitles are on; the 🔊 Listen button also reads the lesson aloud.