bonjour,
triangle rectangle BCD
BD²=BC²+DC²
BD²=5²+6²
BD²=25+36
BD²=61
BD=√61
triangle ABD
BD²=AB²+AD²
61=AB²+7²
61-49=AB²
12=AB²
AB=√12
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bonjour,
triangle rectangle BCD
BD²=BC²+DC²
BD²=5²+6²
BD²=25+36
BD²=61
BD=√61
triangle ABD
BD²=AB²+AD²
61=AB²+7²
61-49=AB²
12=AB²
AB=√12