Identify the Triangle Type: 45-Degree Angle Classification Problem

What type of triangle appears in the drawing?

Since we are given an angle of 45 and an angle of 90, we will refer to the triangle and calculate the missing angle based on the theorem that the sum of angles in a triangle equals 180 degrees.

Let's call this angle alpha:

$\alpha+45+90=180$

$\alpha+135=180$

Let's move the sides:

$\alpha=180-135$

$\alpha=45$

Looking at the second triangle, we notice that the angle adjacent to 90 will also be equal to 90 since it complements to 180 degrees.

Besides this, we don't have any more data, so we won't be able to calculate angles or determine the type of triangle.