18. 11² + c² = 15²
a.±104
b. ±6.1
c. ±10.2
d. ±2​

27 is what percent of 108? 27 is % of 108

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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?