CBSE · Class 6-12

Class 8 · Ganita Prakash

Unit 14 · Class 8Ganita Prakash

Area

Areas of quadrilaterals, circles, and composite figures.

Lessons

3 concepts

1
Trapezium Area
Average of parallel sides × height. Works because a trapezium can be split into a parallelogram and a triangle.
2
Rhombus via Diagonals
Rhombus diagonals are perpendicular and bisect each other. Area is half their product.
3
Circle Area
$A = \pi r^2$ . Use $\pi \approx 22/7$ or $3.14$ . For semicircle: $A/2$ .

Skills to practise

Skill · medium

Area — Practice