Worksheet 1 Square on the radius

1. The radius of this circle is 5 units. The radius is copied on the right. Complete the square on the radius on the right.

Find its area.

1. Use the area of the square to estimate the area of the whole circle.
2. How do you find the area of any square if you know the length of one side (without drawing or counting)?
3. How can you estimate the area of any circle if you know its radius?
4. Describe how the area of any circle is related to its radius. Use words or symbols.