A=pi times r times r
A=49pi
A=49x3.141592...=153.9.8....
sometimes we use 22/7 to do it in our heads
A=49x22/7=154
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A circle with a radius of 11 inches has an area of 380.13 square inches.
A circle with a radius of 18 inches has an area of 1,017.88 square inches.
Area of the circle in square inches = pi*82
A circle with a radius of 3 inches has an area of 28.27 square inches.
The radius of a circle with an area of 706.50 square inches is: 15 inches.