Sebastian had a rectangular piece of paper that was 90 mm long and 50 mm wide he cut paper in half what is the area of each half of the paper in square millimeters A 4500 square millimeters

B 9000

C 2250

D 1125
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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?