Area of triangles, parallelograms, circles

What you'll learn

1. 1

   Imagine a chocolate bar 🍫 shaped like a triangle. Cut it in half — each half is still a triangle!

2. 2

   A triangle inside a rectangle takes up how much of the rectangle?

3. 3

   Slide the triangle to see it fits exactly half a rectangle.

4. 4

   Let's find the area of a triangle with base 6 cm and height 4 cm.

5. 5

   A triangle has base 10 cm and height 5 cm. What's its area?

6. 6

   Now think of a parallelogram like a squashed rectangle 🧱. It has a base and a height — just like a rectangle!

7. 7

   A parallelogram has base 8 cm and height 3 cm. What's its area?

8. 8

   Last one — a circle! Area of a circle = π × r². That's pi (about 3.14) times the radius squared.