- What are two angles called whose sum is 180 degrees?

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What is twice the area of a triangle divided by its height? What is the height of the telephone pole if shadow is 20 feet long and the angle of elevation from the groung if 70 degrees? How many faces and vertices does a gemstone have with 22 edges? What is the exact measure of the angle formed by the hands of a clock at 1240? What is the square root of 228 in radical form?