Nvm i don't need the answer

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?

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?