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a)
Pp=6*8/2
Pp=24cm²
V=1/3 * 24 * 12
V=96cm³
b)
Pp=(4+3)*2/2
Pp=4+3
Pp=7cm²
V=1/3 * 7 * 10
V=70/3
V=23 1/3cm³
c)
Pp=1/2 * a * h
a=6cm
h²=5²-3²
h²=25-9
h²=16
h=4cm
Pp=1/2 * 6 * 4
Pp=12cm²
V=1/3 * Pp * H
Pp=12cm²
H=8cm
V=1/3 * 12 * 8
V=32cm³