Triangle ABC is isosceles.

Triangle KNM is isosceles, where angle N is the vertex.

Triangle SQT is isosceles. The measure of angle STQ is 48°.

The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle?
Isosceles triangle ABC has a perimeter of 96 centimeters. The base of the triangle is and measures 24 centimeters.What is the measure of ?

Right triangle ABC is isosceles and point M is the midpoint of the hypotenuse.

Triangle ABC is shown below.

Consider the diagram and proof by contradiction.Given: △ABC with AB ≅ AC
Consider the diagram and proof by contradiction.Given: △ABC with ∠B ≅ ∠CProve: AB ≅ AC
Triangle XYZ is isosceles. The measure of the vertex angle, Y, is twice the measure of a base angle.What is true about triangle XYZ? Select three options.Angle Y is a right angle.The measure of angle Z is 45°.The measure of angle X is 36°.The measure of the vertex angle is 72°.The perpendicular bisector of creates two smaller isosceles triangles.


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