Circumference and area of circles

What you'll learn

1. 1

   Imagine a bicycle wheel 🚲. The distance all the way around the outside is called the circumference. The space inside the circle is the area.

2. 2

   What do we call the distance around a circle?

3. 3

   Let's find the circumference of a circle with a radius of 5 cm.

4. 4

   Drag the red dot to measure the circumference of this circle. The radius is 3 cm.

5. 5

   Now find the area of the same circle (radius = 5 cm).

6. 6

   What is the area of a circle with radius 4 cm? (Use π = 3.14)

7. 7

   What is the circumference of a circle with radius 7 cm? (Use π = 3.14)