This triangle is a right, isosceles triangle.
Here is how to classify triangles by angles and side lengths:
angles:
right - will be exactly one right angle (like this one)
obtuse - will be exactly one obtuse angle
acute - all three angles will be acute (less than 90 degrees)
side lengths:
equilateral - all 3 sides are the same length
isosceles - exactly 2 sides will be the same length (like this one)
scalene - none of the sides will be the same length
