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F = H ⇒ dianggap 2F
360 = 2E + 2F
360 = 2(2x + 13) + 2(3x + 2)
360 = 4x + 26 + 6x + 4
360 = 10cx + 30
330 = 10x
33 = x
Jadi besar sudut E
E = 2x + 13
E = 2 . 33 + 13
E = 66 + 13
E = 79 derajat