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Give your answer in decimal

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Which letters from the table represent like terms? a and b b and c a and d b and d

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?