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a=7 to Pp=a²=7²=49cm²
H=20cm
V=Pp·H=49·20=980cm³
zad2
a=10dm
to Pp=a²√3/4=10²√3/4=100√3/4=25√3 dm²
H=15dm
V=Pp·H=25√3·15=375√3 dm³
zad3
a=8cm
to Pp=3a²√3/2=3·8²√3/2=3·64√3/2=192√3/2=96√3 cm²
H=10cm
V=Pp·H=96√3·10=960√3 cm³