Jawab mtk poin 12 kelas 8​

PQ = 12 cm
VR = 8 cm
TR = 17

PR = √(17² – 8²)
PR = √(289 – 64) = √225
PR = 15 cm

QR = √(PR² – PQ²)
QR = √(15² – 12²)
QR = √(225 – 144)
QR = √81
QR = 9 cm

Jadi ukuran balok = 12 cm x 9 cm x 8 cm

Luas permukaan balok
= (2 x 12 x 9) + (2 x 12 x 8) + (2 x 9 x 8)
= 2 [(12 x 9) + (12 x 8) + (9 x 8)]
= 2 x (108 + 96 + 72)
= 2 x 276
= 552 cm²