What is the area of a circle with a radius of 10cm?
The circle's area is 314.159 cm2
To find the area you multiply pi (3.14) by the radius and then multiply your answer by the radius again. For example: Say the radius is 10cm. You would go 3.14x10x10. IMPORTANT: 3.14xr2 is different than 3.14xrx2! Also, if you have the circumference of the circle but need the radius, just divide the circumference by 2. Hope this helps!