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Mathematics 17 Online
OpenStudy (anonymous):

an equilateral triangle has a perimeter of 15m. find the lenght of an altitude can anybody help

OpenStudy (whpalmer4):

Do you know the formula for the perimeter of a triangle? With that, you can find the length of one side (x in the attached diagram). Look at the diagram, where I've labeled h as the altitude: does anything look familiar there? Do you know any theorems about right triangles that you might put to use?

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