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The difference between the areas of a semicircle of diameter $2r$ units and the largest triangle drawn inside the semicircle is :
- (a)$\frac{4r^2}{7}$ sq. units
- (b)$\frac{15r^2}{14}$ sq. units
- (c)$\frac{15r^2}{7}$ sq. units
- (d)$\frac{37r^2}{14}$ sq. units
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(A) $\frac{4r^2}{7}$ sq. units