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Find the difference between the perimeter and area of two circles r = 4cm and d = 18cm
S difference = square difference of 9 and 4 * pie = 65 pie
C difference = 18 - 8 = 10
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There are two circles. The sum of their areas is 18 square centimeters. The ratio of the circumference of the big circle to the circumference of the small circle is 3:1
The ratio of the circumference of the big circle to that of the small circle is 3:1
The ratio of the radius of the big circle to that of the small circle is 3:1
The area ratio of the big circle to the small circle is 3: 1: 9: 1
The area of the great circle: 18 △ 9 + 1 × 9 = 81 / 5 square centimeter
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