on calcule Hf²
HF²= 20²+15²=625
on calcule DF
DF²=4²+625
DF=√641≈25,317977..=25,3cm
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on calcule Hf²
HF²= 20²+15²=625
on calcule DF
DF²=4²+625
DF=√641≈25,317977..=25,3cm