In a triangle abc angle b is equal to 60 degree angle c is equal to 40 degree angle is perpendicular to bc and ad
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by Pythagoras theorem
hypotenues^2=side1^2+side2^2
hypoteneus^2=60*60+40*40
hypoteneus^2=3600+1600
hypoteneus^2=5200
taking square root on both side
hypoteneus=72.11........
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