Mark sorted the polygons from his bucket using two categories. He found there are 20 that are quadrilaterals that are not equilateral. If Mark chooses a shape at random from a bucket, what is the probability the shape he chooses will be a quadrilateral? (Enter your answer as a simplified fraction)

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.

c. 6tan80

step-by-step explanation: