A=3x-15°
B=5x+20°
C=7x+10°
tentukan sudut A,B,C
Jawab:
Penjelasan dengan langkah-langkah:
A+B+C = 180
3x-15+5x+20+7x+10 =180
15x +15 =180
15x = 180-15
15x =165
x =11
A= 3x-15° = 3(11) -15 = 18°
B = 5x+20° = 5(11) + 20 = 75°
C = 7x+10 = 7(11)+10 = 87°
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