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<B = 3/2 <A = 3/2 x 1/2 <C = 3/4 <C
<A+<B+<C = 180°
1/2 C + 3/4 C + C = 180
9/4 C = 180
<C = 180 x 4/9 = 80°
<A = 1/2 x 80 = 40°
<B = 3/4 x 80 = 60°