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SABINEMENDES
@SABINEMENDES
April 2019
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Aidez moi s'ilvous plait je donne 19 points !
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(1) carré ABCD diago AC ( ou BD)
AC² = AD²+DC²
= (V8+V2)²+(V8+V2)²
= 8+2V16+2 + 8+2V16+2
= 20+4V16
= 20+16
= 36
AC = V36 = 6
2) A aBCD =(V8+V2)²
= 8+2V16+2
= 18
3) carré EFGH
diago EG ou FH
FH² = FH²+HG² ( on va appeler x les cotés puiqu'ils sont egaux, on ecrit)
(V40)² = x²+x²
(V40)² = 2x²
x² = (V40)²/2 = (V20)²
x = V20 = 2V5
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AC² = AD²+DC²
= (V8+V2)²+(V8+V2)²
= 8+2V16+2 + 8+2V16+2
= 20+4V16
= 20+16
= 36
AC = V36 = 6
2) A aBCD =(V8+V2)²
= 8+2V16+2
= 18
3) carré EFGH
diago EG ou FH
FH² = FH²+HG² ( on va appeler x les cotés puiqu'ils sont egaux, on ecrit)
(V40)² = x²+x²
(V40)² = 2x²
x² = (V40)²/2 = (V20)²
x = V20 = 2V5