Omg please help me :(

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?

Which term applies to agb and dge? a. obtuse b. supplementary c. complementary d. vertical

Why is x= 4 a solution to the proportion 14/x 56/1 6