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d) (99+33+21)*2cm²=153*2cm²=306cm²
c)4cm x 4cm x 7cm
Pc= 2*4*4+4*4*7=32+112=144cm²
d)11cmx9cmx3cm
Pc=2*11*9+2*11*3+2*9*3=198+66+54=318cm²
h = 7
P boczne = 7*4 = 28cm²
Pc= 2*16 + 4*28 = 32 + 112 = 144
lub II sposób:
ze wzoru:
a=4
b=4
c=7
Pc= 2ac + 2bc + 2ab
Pc = 2*4*7 + 2 *4*7 * 2*4*4 = 2*28 + 2*28 + 2*16 = 144 cm²
B)
Pc= 2ac + 2bc + 2ab
Pc = 2*11*3 + 2*9*3 + 2*11 * 9
Pc = 66 + 54 + 198 = 318