Which math sentence can be used to determine if this triangle is a right triangle?

A triangle has side lengths 12, 15, 18.

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63

Complete the steps, which describe how to find the area of the shaded portion of the circle. find the area of the sector by multiplying the area of the circle by the ratio of the to 360. subtract the area of the triangle from the area of the sector.

Ihonestly have no clue if it's each or none.