Well, sweetheart, to divide a circle into 20 equal parts, you simply start by drawing a vertical line through the center, then draw another line at 18 degrees from the first line, and keep going at 18-degree intervals until you've got yourself 20 equal slices of that circle. Easy as pie... or should I say, easy as circle?
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Mark out 20 arcs of 18 degrees around its circumference and join them to the circle's centre
A circle has 360 degrees. Divide 360 by 18 and you will find that each equal part of the divided circle is 20 degrees.
Divide the circumference by (2 x pi).
Just divide the circumference by (2 x pi). Pi is about 3.1416.
855.21 square feet. A circle with a radius 70 would be (pi)(radius squared) = (3.1416) (70) (70) = 15,393.8 square feet. With a 20 degree angle that is 20/360ths of a circle, so multiply your circle area by 20 and divide by 360 = 855.21 square feet.
The diameter is the same as the length, so it is 20 inches. If you meant to say that the circumference was 20 inches, then divide by pi, which is 3.1416 20 / 3.1416 = 6.4 inches