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UTV=PTS
TVU=SPT
maka PST=TUV =8x
PST=RSQ=8x
karena jumlah sudut segitiga adalah 180 derajat, maka:
RQS+QSR+RSQ=180
7x+9x+8x=180
24x=180
x=180/24
x=7,5
TUV=8x=8 x 7,5 =60 derajat
NO 12
a.
RQP=180-RQS
RQP=180-112
RQP=68
RPQ=QPR=x
x=180-68
x=112
SUDUT P= 1/2 x
SUDUT P= 1/2 x112
SUDUT P =56 derajat
b.
ABC=180-5p
CAB+ACB+ABC=180
48+3p+180-5p=180
3p-5p=180-180-48
-2p=-48
p=24