P = ½*d*d
20cm² = ½*20*d
20 = 10*d /:10
2 = d
d = 2
spr.
P = ½*20*2 = 10*2 = 20cm²
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P = ½*d*d
20cm² = ½*20*d
20 = 10*d /:10
2 = d
d = 2
spr.
P = ½*20*2 = 10*2 = 20cm²