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10x +2 = 180°
10x = 180° -2
10x = 178°
x = 17,8°
Maka, nilai x = 17,8°
b. 5x +6
= (5 . 17,8) +6
= 89 +6
= 95
4x +4
= 4(17,8) +4
= 71,2 +4
= 75,2
x -8
= 17,8 -8
= 9,8
Jadi, segitiga tersebut berjenis segitiga tumpul.