Respuesta :

,sum of triangle is 180 so this triangle is right angle it has 90 angle and 40 add them and then subtract 180-130

Angle B is 50 degrees. We already know that the interior angles of any triangle must add up to 180 degrees. It is given to us that we have a 90 degree angle and a 40 degree angle in our triangle. We must solve for x (in this case Angle B.) Set up the equation and solve.

180=90+40+x

90=40+x

50=x

Therefore Angle B is 50 degrees