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Pp= a * b
Pp= 9 * 12
Pp= 108 cm
H= 12,5 cm
V= 108 * 12,5= 1350
V=1350 cm³
(12,5)²+H²=(2,5√9)²
156,25+H²= 56,25
H²= 100
H=√100 = 10
V= ⅓Pp×H
V= 36 × 10= 360cm³