Sixth Grade Challenging Math

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6-67) Answer

0.285R^{2}

Solution: Area of a quarter circle is 1/4 *3.14*R^{2, }Area of the right triangle formed by 2 lines labeled "R" is 1/2R^{2}

Area in red = Area of a quarter circle - Area of a triangle = 1/4 *3.14*R^{2 }- 1/2R^{2} = 0.285R^{2}