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podstawa ma a=24 i h=9cm
to Pp=1/2·a·h=1/2·24·9=108cm²
ramie b=15cm
wysokosc bryly H=27cm
Pb=aH+2bH=24·27+2·15·27=648+810=1458 cm²
pole calkowite graniastoslupa
Pc=2Pp+Pb=2·108+1458=216+1458=1674 cm²
b) graniastoslupa prosty w podstawie ma trapez rownoramienny
trapez ma
a=20cm h=8cm ramie c=10cm
b=8 cm
wysokosc bryly H=28cm
czyli Pp=1/2·(a+b)h=1/2·(20+8)·8=1/2·28·8=112cm²
Pb=aH+bH+2·c·H=20·28+8·28+2·10·28=560+224+560=1344cm²
pole calkowite graniastoslupa
Pc=2Pp+Pb=2·112+1344=224+1344=1568cm²