2points
which of the following are mathematical sentences? check all that apply.
✓
a. 4- d= 8
b. 59
c. 6
o d. 4-v
e. 3+2 = 5
of 1< 2

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?