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= 48
b. SQ = L . 2 : alas
= 48 . 2 : 16
= 6
PT² = PR² - TR²
PT² = 16² - 12²
PT = √112
PT = 4√7
QT = PT - PQ
= 4√7 - 8
= 4(√7 - 2)
Luas PTR = 1/2 . PT . RT
= 1/2 . 4√7 . 12
= 24√7
Luas QTR = 1/2 . QT . RT
= 1/2 . 4(√7 - 2) . 12
= 24√7 - 48
Luas PQR = luas PTR - luas QTR
= 24√7 - (24√7 - 48)
= 24√7 - 24√7 + 48
= 48 cm²
2)
Luas PQR = 1/2 . PR . SQ
48 = 1/2 . 16 . SQ
SQ = 6cm