The sum of the radii of the two circles is 12cm. The diameter of the small circle is 10cm. What is the area of the big circle?

The sum of the radii of the two circles is 12cm. The diameter of the small circle is 10cm. What is the area of the big circle?

10/2=5cm
12-5=7cm
Area of circle = π R & # 178;
3.14*7²=153.86cm²
A: the area of the big circle is 153.86cm-178;
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The area of a triangle is 15 square centimeters. What's the area of a circle
The triangle is half of the largest square in the circle, and the square has an area of 30 square centimeters

15π

In a quarter circle, there is a triangle with an area of 15 square centimeters. What is the area of this circle?

This is a right triangle, and its two right sides are the two radii of the quarter circle. Therefore, the radius is the arithmetic square root of (15x2), that is √ 30s = 1 / 4 * r * r * 3.14 = 1 / 4 * 30 * 3.14 = 23.55 (cm2)