If the three sides of △ ABC a, B, C satisfy a + B = 10, ab = 18, C = 8, try to judge the shape of △ ABC
Because a + BB = 10, ab = 18
So A2 + B2 = (a + b) 2-2ab = 64 = C2
So it's a right triangle
And a is not equal to B
So it is a general right triangle
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