Unit#5 Triangle Theorems Pre-Assessment (SY23-24)

Classify the following triangles by angles:

• Right Triangle

• 
• Equiangular Triangle

• 
• Obtuse Triangle

• 
• Acute Triangle

• 

Classify the following triangles by sides:

• Equilateral Triangle

• 
• Scalene Triangle

• 
• Isosceles Triangle

• 

The Triangle Sum Theorem states that the sum of the measures of the interior angles of a triangle is ____.

How many degrees is the angle in the triangle indicated by the blue arrow?

Label the angles indicated with green and blue arrows.

d

b

Interior Angle(s)

Similar Angle(s)

Congruent Angle(s)

Exterior Angle(s)

The Exterior Angle Theorem states that an ​ (a)   angle is always equal to the ​ (b)   of the two non-adjacent ​ (c)   angles.

• exterior
• interior
• sum
• difference

Angles 1 and 2 are ​ (a)   angles. ​ (b)   angles are ​ (c)   .

• vertical
• adjacent
• Adjacent
• complementary
• supplementary
• Vertical
• congurent

Angles 3 and 4 are ​ (a)   ​angles. ​ (b)   angles are ​ (c)   . ​

• vertical
• adjacent
• Vertical
• Adjacent
• complementary
• supplementary
• congruent