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the answer is 78.5
use the formula pi r2. when rounded pi can equal 3.14 or 22/7. r is the radius of the circle. the diameter is 10 and 10/2 = 5 so the radius of the circle is 5. 52 = 25.
25 x 3.14 = 78.5
a easy way to remember this formula is to know that even though the formula (pi r2) says that "pies are square", pies really are round.
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