What is the surface area, in square centimeters, of the square pyramid

For each proportion find the unknown number x 1/5/8=×/15

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.

What are the first 4 terms in the multiplication pattern given by the formula 2×4n