Use graphs f and g to graph f+g

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?

Pls math have no ideamultiply and simppify. 2x^2y^3z^2 • 4xy^4x^2

Which angle of rotation is an angle of rotational symmetry for all figures?