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OpenStudy (anonymous):
A triangle has side lengths of 7 centimeters and 12 centimeters. Two of its angles measure 63* and 18*. Which pair of dimensions below could possibly be the third side length and third angle of the triangle? A 3 cm, 45* B 19 cm, 81* C 18 cm, 99* D 20 cm, 99*
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OpenStudy (anonymous):
what does the three angles of a triangle add up to?
OpenStudy (anonymous):
The three angles have to add up to 180 degrees
OpenStudy (anonymous):
180 - (63+18)
OpenStudy (anonymous):
That's 99*
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