bonjour
BR/BA = BP /BC = RP / AC
BR / 17.5 = 5 /14
⇔ BR = 6.25 cm
AC² = BA² - BC²
AC² = 17.5² - 14 ²
AC² = 110.25
AC = √110.25 = 10.5 cm
BP/BC = RP/AC
5/14 = RP /10.5
⇔ RP = 3.75 cm
RB² = RP² + BP²
6.25 ² = 3.75² + 5 ²
39.0625 = 39.0625
donc BPR est rectangle