Given :
A triangle, ABC, has angle measures of 45°, 45°, and 90º and two congruent (equal) sides.
So, the triangle will be classified as : isosceles right triangle
Because, it has an angle = 90, so it will be a right triangle
And there are 2 congruent sides, so, it will be isosceles triangle
so, the answer is : Isosceles right triangle