What is the SSS of a triangle?

" SSS " is when we know three sides of the triangle, and want to find the missing angles. and finally use angles of a triangle add to 180° to find the last angle. We use the “angle” version of the Law of Cosines: c = 7. Use The Law of Cosines first to find one of the angles. It doesn’t matter which one. Let’s find angle A first:
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