To get the congruent angles we shall use the sine rule since we have the length of at least 1 side and the values of the angles. Base length=12 inches Base angles=50° Third angle=180-(100)=80° thus applying the sine rule we shall have: a/sin A=b/sin B=c/sin C thus we can get the congruent side as follows: a/sin 50= 12/sin 80 a=(12 sin 50)/sin 80 a=9.334 inches since the sides are congruent then the other congruent side will have a length of 9.334 inches
