A right angled triangle.
a right triangle
A rectangle has four sides whereas a right angle triangle has only three sides.
There are three sides.
A right angle triangle
right angle triangle
A right-angle triangle.
All triangles have three sides.
To calculate any of the three sides in a right triangle, if you know the other two sides; also, to verify that an angle is a right angle, if you know three sides of a triangle.
A triangle with a right angle and different lengths for sides is a right, scalene triangle.
All triangles have three sides. If it doesn't have three sides, it's not a triangle.
It has 2 equal sides of right triangle.
Five side is always a pentagon, but there's no pentagon that always has exactly one right angle. A regular pentagon has no right angles. An irregular pentagon can have one, two, or three right angles, or none.