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Math and Puzzles - Mixed Problem Set
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If the radius of a circle is diminished by 10%, then its area is diminished by:
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A
0.19
💡 Explanation:
Area is proportional to the square of the radius. If the radius becomes 0.9r, the area becomes (0.9)^2 = 0.81 of the original area. The diminution is 1 - 0.81 = 0.19, or 19%.