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Sagot :

Pythagorean Theorem

a^2+b^2=c^2

12^2+x^2=20^2

144+x^2=400

x^2=256

[tex]x = \sqrt{256} = 16[/tex]

12²+x²=20²

144+x²=400

400-144=256 . 144-144=0

x²=256

=16