Such is called an exterior angle. A useful theorem is that an exterior angle is equal to the sum of its non adjacent interior angles.
a right triangle
The supplementary angle of the triangle.
right triangle
They are:equilateralacute angled isoscelesacute angle scaleneright angled isoscelesright angle scaleneobtuse angled isoscelesobtuse angle scalene.
A right triangle.
The supplementary angle of the triangle.
a right triangle
A 90o angle is a right angle, and a triangle with a right angle is called a right triangle.
A right angle triangle
A 90o angle is also called a Right Angle, so a triangle that has one 90o angle is a Right angle triangle.
a right angle triangle is its name
right triangle
Obtuse-angled triangle
They are:equilateralacute angled isoscelesacute angle scaleneright angled isoscelesright angle scaleneobtuse angled isoscelesobtuse angle scalene.
a right triangle
A right triangle.
The name of a triangle is dependent on the type of angles within it. If it has a right angle it is called a right triangle, if it has an obtuse angle it is an obtuse triangle, and if all three sides are acute it is an acute triangle.