Area Problems
If the radius of a circle is decreased by 50% , find the percentage decrease in its area.

25%
75%
65%
35%

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Area Problems
The length of the diagonal of a rhombus is 80% of the length of the other diagonal, Then the area of the rhombus is how many times the square of the length of the longer diagonal?

1/4
2/5
4/5
3/4

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