b) Niveau + : On donne MH = 3 cm, BC=8cm et CBH =36° calculer MB j ai besoin de votre aide. merci beaucoup. c est pour demain.​

Réponse:

[tex] \sin(cbh) = \frac{ch}{bc} \\ ch = bc \times \sin(cbh) \\ch = 8 \times \sin(36) \\ c h= 4.7cm \\ {bc}^{2} = {bh}^{2} + {ch}^{2} \\ {bh}^{2} = {bc}^{2} - {ch}^{2} \\ bh = \sqrt{ {bc}^{2} - {ch}^{2} } \\ bh = \sqrt{ {8}^{2} - {4.7}^{2} } \\ bh = \sqrt{64 - 22.09} \\ = 6.47cm \\ mb = mh + bh \\ mb = 3 + 6.47 \\ mb = 9.47cm[/tex]