Question 1115933
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You don't need to do any arithmetic using the formula for the area of a circle.<br>
All circles are similar; in similar figures, if the ratio of lengths is a:b, the ratio of areas is a^2:b^2.<br>
The ratio of lengths (radii of the two circles) is given as 2.5:1; so the ratio of areas is (2.5)^2:1^2 = 6.25:1<br>
Then the area of the larger circle is 8*6.25 = 50 square yards.