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kata kuncinya
<P + <S = 180
3x + 5 + 5x + 15 = 180
8x + 20 = 180
180-20 = 8x
160 = 8x
x = 160/8
x = 20
<Q = <S
<Q = 5x + 15
<Q = 5(20) + 15
<Q = 100 + 15
<Q = 115 derajat
jadi jumlah sudut berdekatan = 180derajat
p + s = 180derajat
3x + 5 + 5x + 15 = 180
8x + 20 = 180
8x = 160
x = 20
sudut Q = sudut s
maka => 5x + 15
= 5 ( 20 ) + 15
= 100 + 15
= 115 derajat
maaf kalau salah