This lesson teaches how to classify triangles by examining their properties, focusing on angles and sides. It explains the concept of angles, congruent sides, and the use of measurement tools. Triangles are classified by their angles into acute, obtuse, and right triangles, and by their sides into scalene, isosceles, and equilateral triangles. The lesson concludes with examples of combining angle and side classifications.

What is the best tool to use when determining if sides are congruent?

• A protractor

• A compass

• A ruler

• A calculator

What is the sum of the angles in any triangle?

• 360 degrees

• 270 degrees

• 180 degrees

• 90 degrees

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

• Equilateral triangle

• Obtuse triangle

• Right triangle

• Acute triangle

What type of triangle is triangle PAT, which has one right angle?

• Obtuse triangle

• Acute triangle

• Right triangle

• Scalene triangle

Which triangle has no sides of equal length?

• Isosceles triangle

• Right triangle

• Equilateral triangle

• Scalene triangle

What is a triangle with two congruent sides called?

• Right triangle

• Equilateral triangle

• Scalene triangle

• Isosceles triangle

If a triangle has three equal sides, what is it called?

• Obtuse triangle

• Isosceles triangle

• Equilateral triangle

• Scalene triangle