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Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?