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p=3*3=12[j²]
2)
e*f/2
13*17/2=110,5
p=110,5[j²]
P=3*3
P=9
2)
e*f/2
13*17/2=110,5
p=110,5[j²]
12 / 4 = 3
P =a * a
a = 3
P = 3 * 3 = 9 <cm 2 >
2
P= e * f /2
e = 13cm
f = 17cm
p = 13 * 17 / 2 = 221 / 2 = 110.5 <cm 2 >