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L . PQRS = 180 CM²
L . PQLK = 120CM²
L . PQRS = p . l
180 = 15 . l
l = 180 / 15
l = 12 cm
L . PQLK = p . t
120 = 15 .t
t = 120/15
t = 8 cm
V = p . l . t
= 15 . 12.8
= 1440 cm³
2.)
p : l : t = 4 :3 :2
luas alas = 108cm²
L. alas = p . l
108 = 4x . 3x
108 = 12x²
x² = 108 /12
x² = 9
x =√9
x = 3cm
p = 4.3 =12cm
l = 3.3 = 9cm
t = 2.3 = 8cm
v = p . l . t
= 12. 9. 8
= 864 cm³