=(new-old)/old *100%
=(90-75)/75 *100%
=20%
<span> hope it helps</span>
Answer: Choice C
There is no way to figure out if angle 4 and angle 7 are congruent. If we knew they were right angles, then we would be able to determine that. However, that isn't the case here.
If the radius (r) is 36 inches, the circumference of the circle is C = 2pi r,
or C = 2pi(36 inches) = 72pi inches. Please note: that's pi, not pie.