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9x+9 = 180
9x = 180-9
9x = 171
x = 19
(disubtitusi)
= 2x
= 2(19)
= 38°
= 3x-5
= 3(19)-5
= 57-5
= 52°
= 4x+14
= 4(19)+14
= 76+14
= 90°
2x+(3x-5)+(4x+14)=180
9x+7x+9=180
9x+9=180
9x=180-9
9x=171
x=171/9
=19
besar sudut:
2x=2 x 19=38°
3x-5=(3 x 19)-5=52°
4x+14=(4 x 19)+14=90°
Jawaban: A