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18x = 90
x = 90:18
x = 5
7x = 7(5)
=35°
11x=11(5)
=55°
Selisih 55-35
20°
14. 5x°+(3x-7)°+(2x-3)°=180°
10x -10 =180°
10x =180+10
x=190/10
x=19
5x = 5(19)
=95°
3x-7 = 3(19)-7
= 57-7=50°
2x-3=2(19)-3=38-3=35°
15. QU = RT
110°= 110°
PQU = 180-UQR
=180-70
=110
PQU =110°
QRT=110°
QRU =PQU -URT
=110°-35
=75°
Ini dia Jawaban dari saya, semoga membantu ya