Find the area of the circle and divide by 4.
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In order to find the area of a circle, the important thing is to the find the radius first. Given that the circumference of a circle is 2πr (where r=radius), then Circle 1: 2πr=25π or r=25/2 Circle 2: 2πr=75π or r=75/2 The area of a circle is πr2. Therefore, Area of Circle 1: π(25/2)2=625π/4 Area of Circle 2: π(75/2)2=5625π/4
A circle with a diameter of 25 mm has an area of 490.9 square mm.
A circle with a radius of 25 cm has an area of 1,963.5 square cm.
A circle with a radius of 12.5 feet (25/2) has an area of 490.87 square feet.
490.9 square inches for a 25-inch diameter circle.