The sum of the area of a and B circles is 680 square centimeters. The radius ratio of a and B circles is 5:3. What is the area of a square centimeter and that of b square percent The sum of the two circles is 680 square centimeters. The radius ratio of a and B is 5:3. What's the area of a and B

Because the circle area formula is 3.14 × radius square
So area ratio = square of radius ratio
The area ratio of the two circles is 25:9
Area a: 680 × 25 / (25 + 9) = 500 (cm2)
Area B: 680-500 = 180 (square centimeter)

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