a right angle triangle.
A right triangle has three sides and one right angle.
A right (angled) triangle.
A right angle triangle
A right triangle has an acute and right angle.
A right angle triangle. (if it is a triangle)
A right angle triangle
A right angle triangle
a 3 sided shape is a right angle triangle
A triangle can have a right angle, but it isn't regular if it does. Rectangles aren't regular, but have four right angles. Squares are regular quadrilaterals, and have four right angles. No other regular polygon has any right angles.
a right angle triangle.
a right triangle
right angled triangle
A right triangle has three sides and one right angle.
A right (angled) triangle.
A Right Triangle or sometimes called a Right-angled Triangle has one angle = 90 degrees
An obtuse triangle.