1. DC^2=CB^2+BD^2
8.5^2=7.5^2+BD^2
8.5^2=72.25
7.5^2=56.25
72.25-56.25=16
BD=racine carré de 16 =4cm
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1. DC^2=CB^2+BD^2
8.5^2=7.5^2+BD^2
8.5^2=72.25
7.5^2=56.25
72.25-56.25=16
BD=racine carré de 16 =4cm