Cos(theta) = adjacent/hypotenuse
cos(theta) = 6/20
cos(theta) = 0.3
Use the inverse cos or cos^-1 on your calculator to get the angle
theta = 72.5
Step-by-step explanation:
They are asking, like units are in the sum
To find the circumference of a round object, you will take the diameter and multiply is by pi to get 78.5mm