sin ^(BAH) = BH/AB = 5/8 = 0.625 ⇒ ^BAH = 38.68°
cos ^(ABH) = 5/8 = 0.625 ⇒ ^ABH = 51.32°
sin ^(HAC) = 3.5/7 = 0.5 ⇒ ^ HAC = 30°
cos ^(HCA) = 3.5/7 = 0.5 ⇒^ HCA = 60°
^A = 38.68 + 30 = 68.7°
^B = 51.3°
^ C = 60°
on vérifie : A + B + C = 180°
68.7+51.3+60 = 180° ok
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sin ^(BAH) = BH/AB = 5/8 = 0.625 ⇒ ^BAH = 38.68°
cos ^(ABH) = 5/8 = 0.625 ⇒ ^ABH = 51.32°
sin ^(HAC) = 3.5/7 = 0.5 ⇒ ^ HAC = 30°
cos ^(HCA) = 3.5/7 = 0.5 ⇒^ HCA = 60°
^A = 38.68 + 30 = 68.7°
^B = 51.3°
^ C = 60°
on vérifie : A + B + C = 180°
68.7+51.3+60 = 180° ok