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Luas segitiga PQR = 1/2 . a . t
= 1/2 . 8 . 5
= 1/2 . 40
= 20
Luas segitiga PQS = 1/2 . a . t
= 1/2 . 8 . 8
= 1/2 . 64
= 32
luas segitiga PQT = 1/2 . a . t
= 1/2 . 8 . 3
= 1/2 . 24
= 12
luas yang diarsir = luas segitiga PQR + luas segitiga PQS - 2 . luas segitiga PQT
= 20 + 32 - 2 . 12
= 52 - 24
= 28
jadi luas daerah yang diarsir adalah 28 cm²