P = 120 cm
d1 = 20 cm
d2 = ?
P = 1/2*d1*d2
1/2*20*d2 = 120
10*d2 = 120 |:10
d2 = 12 cm << druga przekątna
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P=1/2 pq
p=20cm
q=?
120=1/2 * 20 *q
q=12cm
120 = ½ * 20 * d₂
120 = 10 * d₂ / :10
d₂ = 12
odp. 2 przekątna ma 12 cm .
P = 120 cm
d1 = 20 cm
d2 = ?
P = 1/2*d1*d2
1/2*20*d2 = 120
10*d2 = 120 |:10
d2 = 12 cm << druga przekątna