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.
The supplementary angle of the triangle.
a right triangle
The angle that is not congruent to the base angles of an isosceles triangle is called the "vertex angle." In an isosceles triangle, the vertex angle is formed by the two equal sides, while the base angles are the angles opposite the equal sides.
right triangle
They are:equilateralacute angled isoscelesacute angle scaleneright angled isoscelesright angle scaleneobtuse angled isoscelesobtuse angle scalene.
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 right angle triangle is its name
right triangle
A 90o angle is also called a Right Angle, so a triangle that has one 90o angle is a Right angle 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.