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Mathematics, 28.10.2020 18:40 XxKaitlynnxX

Efrain is setting posts in the ground for a fence and wants to make sure the post and level ground make a right triangle. He doesn't have a level, so instead he ties a string to the top of the post and attaches the other end to the ground using a big nail and makes measurements as shown in the diagram. How can he use his measurements to determine if the post and ground are at right angles?

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