(1/2)x x 3/43=

Pls im so close for finishing 20 POINTS

What two criteria are needed for triangles to be similar

What is an alternate exterior angle

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?