Identify the pattern and fill the blank

Askateboard ramp is in the shape of a right triangle what is the height of the ramp

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?

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so