One of its interior will be 90 degrees.
also there will be a little box in the corner to show that it is a right angle.
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right triangle
If one of the three interior angles is 90 degrees then it is a right triangle.
If all of the angles in a triangle are acute then it is an acute triangle. If one angle is right (or 90 degrees) then it is a right triangle. If one angle is obtuse then it is an obtuse triangle.
It is formed by the diagonal of a rectangle
use the pathagory intherum