8.4 Area of Circles

Find the area of a circle with diameter 6.4 cm.

Round to the nearest whole number.

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Find the area of a circle with radius 9 cm.

Write your answer in terms of Pi.

Answer explanation

If A = 136.46 square cm, what is the approximate Circumference of the circle? Round 2 decimal places.

If C = 7.85cm, what is the approximate Area of the circle? Round 1 decimal place.

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ABCD is a square. Find the area of the shaded region. Round to the nearest whole number.

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The three circles are tangent. Find the area of the shaded region. Round to the nearest tenth. (1 decimal place)

Answer explanation