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9x + 5x + 4x = 180
(9+5+4)x = 180
18x = 180
x = 180/18
x = 10
b) <P = 9x = ( 9 x 10 ) = 90 derajat
<Q = 5x = ( 5x 10) = 50 derajat
<R = 4x = (4 x 10 ) = 40 derajat
c)ingat, bahwa di depan sudut terpanjang ada sisi terpanjang
maka urutannya dr terpanjang
RQ, RP, PQ
sisi terpanjang = RQ
sisi terpendek = PQ
jawab: 9X+5X+4X=180
18X =180
X =180/18
X = 10
b. besar <p <q <r
jawab: <p=90 derajad
<q=180-(90+40)
=180-130
=50 derajad
<r=180-(90+50)
=180-140
= 40 derajad
semoga membantu.............!!!!!!!!