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How do I do this I am trying to find what d is so all together in the end it has to equal 180 degrees

How do I do this I am trying to find what d is so all together in the end it has to equal 180 degrees class=

Respuesta :

It shouldn't add up to 180 degrees, you're looking for the length of the sides not the degree of the angle. Because it's an equilateral triangle, all sides are the same, so you can just set them equal to each other. D=5