# Pre cal

Find the area of a triangle with sides of 12, 14 and 20

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1. Use the Cosine Law to find the angle Ø opposite side 12 by

12^2 = 14^2 + 20^2 - 2(14)(20)cosØ

then use
Area = (1/2)(14)(20)sinØ

or you might want to Google "Heron's Formula"
it is an interesting method

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posted by Reiny

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