Classifying a triangle with a 90-degree angle as a right triangle

Identifying an equilateral triangle by its sides and angles

Identifying an isosceles triangle and finding its missing angle

Identifying a scalene triangle with no congruent sides or angles

Classifying a triangle using vertices on a coordinate grid

Proving a triangle is not right using perpendicular slopes

Testing for right triangle and classifying using vertices on a grid

Finding a missing angle to classify an equilateral triangle

Finding a missing angle and classifying a scalene right triangle

Using the exterior angle theorem to find x and classify the triangle

Finding missing angles in a triangular chocolate box