Answer:
27 years
Step-by-step explanation:
Let Holly's age be h and Aunt's age be a. We can setup 2 equations and solve.
1. 
2. a - 15 = h
We can plug in equation 2 into equation 1 to solve for aunt's age:

Holly's aunt's age is 27
All sides are equal on a triangle
Answer: Option 'C' is correct.
Step-by-step explanation:
Since we have given that

An arc is a part of total circumference of circle and length of that arc is the measurement of linear distance.
Since we know the formula for "Length of an arc " , we get

Hence, Option 'C' is correct.