SOLUTION: what are the angles of a triangle that has sides of 21 28 and 30
-> SOLUTION: what are the angles of a triangle that has sides of 21 28 and 30
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what are the angles of a triangle that has sides of 21 28 and 30
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Use the law of cosines:
c^2 = a^2 + b^2 - 2abcos(C)
900 = 441 + 784 - 2*21*28*cos(C)
cos(C) =~ 0.27636
C =~ 73.96º
Do the other 2 the same way, or use the Law of Sines