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podstawa:
a=3cm
b=9cm
h=4cm
obliczam ramię:
h=√3²+4²=√9+16=√25=5cm
pole 2 podstaw=2×½(a+b)h=(3+9)×4=48cm²
pole całkowite=48+2×5×20+3×20+9×20=48+200+60+180=488cm²