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P - pole deltoidu
p, q - przekątne
P=pq/2 /×2
2P=pq /:p
q=2P/p
q=2×24/8
q=48/8
q=6cm
P=24cm2
d1=8cm
d2=6cm
Spr.:
P= (d1∙d2):2
d1=8cm
d2=6cm
P=(8∙6):2
P=48:2
P=24cm2