gothchick
14

# circle is divided into 20 equal parts. What is the angle measure of three of those parts?

first, imagine a circle divided into 4 quarters than you may use the following proportion angle measure ------- part of circle $90^0 - -----\frac14\\ x \ \ ------\frac3{20}\\ \\ \frac14x=90^0\cdot\frac3{20}\\ \frac14x=\frac{270}{20}\\ \frac14x=\frac{27}2\ \ \ \ |\cdot4\\ x=\frac{27}2\cdot4\\ x=\frac{108}2\\ \boxed{x=54\ degrees}$