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a=10
Pb=6*ah÷2=6*10*10÷2=300 [cm2]
Liczę bok podstawy:
r=a
a= 0,5 * 10 = 5
Licze pole jednej ściany bocznej:
0,5 a * h = 0,5 * 5 * 10 = 25
25 * 6 = 150 cm2