How to Determine if an Angle is Included or Not - Congruent Triangles

The video tutorial explains the concept of included angles, which are angles between two sides of a triangle. It discusses the side angle side (SAS) congruence criterion and provides examples to illustrate included angles. The tutorial also highlights the importance of ensuring angles are included between the sides when determining congruence, and explains why some triangles may not be congruent if the angles are not properly included.

What is an included angle in a triangle?

• An angle that is outside the triangle

• An angle between two sides of a triangle

• An angle that is equal to 90 degrees

• An angle that is not part of the triangle

Why are included angles important for the SAS congruence criterion?

• They must be between the two sides being compared

• They are the largest angles in the triangle

• They are always equal in congruent triangles

• They determine the length of the sides

Which of the following is true about included angles?

• They must be between the two sides for SAS

• They are not necessary for triangle congruence

• They can be skipped when proving SAS congruence

• They are always the smallest angles in a triangle

What mistake should be avoided when using the SAS criterion?

• Using sides that are not equal

• Using angles that are equal

• Using only one side and one angle

• Using angles that are not between the sides

What happens if you skip an angle when applying the SAS criterion?

• The triangle becomes isosceles

• The triangle becomes equilateral

• The angle becomes an exterior angle

• The congruence cannot be proven