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S = e*f/2
e = 16 cm
f = 12 cm
S = 16 * 12 / 2 = 96 cm2
S = 96 cm2
obwód:
Ob = a+a+a+a
Ile ma ściana:
12 - 100%
x - 80%
x = 12 * 80 / 100 = 9,6
x = 9,6
ściana (a) = 9,6
Ob = 9,6 + 9,6 + 9,6 + 9,6 = 38,4
P= 1/2 razy 16 razy 12
P= 1/2 razy 192
P= 96 CM KWADRATOWYCH!
Zaraz ci obwód podam
e=12
f=16
P=16*12/2= 96