Area of a Circle Worksheet with Answer Key

What's on the worksheet

1. Find each circle's area exactly and rounded to one decimal place.
   r = 5\text{ cm}d = 16\text{ m}r = 2.5\text{ m}d = 30\text{ in}r = 1.2\text{ cm}
2. Find the radius and diameter of each circle from its area.
   A = 81\pi\text{ cm}^2A = 144\pi\text{ m}^2A = 6.25\pi\text{ in}^2A = 0.49\pi\text{ m}^2
3. Word problem: tape around the edge of a round gym mat.
4. Find Lucas's mistake in the area of a round mirror.
5. Compare the paper used by two sizes of sticker.
6. Word problem: the grooved area of a vinyl record outside its label.
7. Find the radius of a round cushion top with the same area as a square of fabric.