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<A = <B = 6X-12
<C = 4X+10
⇒
2(6X-12) +4X+10 = 180
12X -24 +4X +10 = 180
16X - 14= 180
16X = 180+14
16X = 194
X =194/16
X = 12.125
<A =12.125*6-12
72.75-12 =
60.75°