Types and Properties of Triangles

This video tutorial teaches how to classify triangles by examining their properties. It covers the basics of angles, explaining how they are formed and measured. The tutorial then demonstrates how to classify triangles based on their angles into obtuse, acute, or right triangles. It also explains how to classify triangles by their sides into scalene, isosceles, or equilateral triangles. The video concludes with an example of classifying a triangle as an obtuse isosceles triangle.

What is an angle formed by?

• Two points

• Two planes

• Two lines

• Two rays

What is the sum of the angles in a triangle?

• 90 degrees

• 360 degrees

• 180 degrees

• 270 degrees

Which type of triangle has one angle greater than 90 degrees?

• Obtuse triangle

• Right triangle

• Equilateral triangle

• Acute triangle

What type of triangle has all angles less than 90 degrees?

• Obtuse triangle

• Right triangle

• Acute triangle

• Scalene triangle

Which triangle has one right angle?

• Acute triangle

• Right triangle

• Obtuse triangle

• Isosceles triangle

What is a scalene triangle?

• A triangle with two sides equal

• A triangle with one right angle

• A triangle with all sides equal

• A triangle with no sides equal

Which triangle has two congruent sides?

• Isosceles triangle

• Right triangle

• Equilateral triangle

• Scalene triangle

What is an equilateral triangle?

• A triangle with all sides equal

• A triangle with two sides equal

• A triangle with no sides equal

• A triangle with one obtuse angle

What type of triangle has three congruent sides?

• Right triangle

• Isosceles triangle

• Scalene triangle

• Equilateral triangle

How would you classify a triangle with two congruent sides and one obtuse angle?

• Scalene acute triangle

• Isosceles obtuse triangle

• Equilateral right triangle

• Scalene right triangle