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L[PRT]=1/2.(PQ+QT).RT
L[PRT]=1/2.(10+6).12
L[PRT]=96cm^2
L[QRT]=1/2.QT.RT
L[QRT]=1/2.6.12
L[QRT]=36cm^2
L[PQR]=L[PRT]-L[QRT]
L[QRT]=96-36
L[QRT]=60cm^2
B)panjang QS
QS adalah tinggi dari segitiga PQR dengan alas PR, maka :
L[PQR]=1/2.PR.QS
60=1/2.20.QS
QS=60/10
QS=6cm
maaf klo ada kesalah yaahh ^^