Triangle Classify + Interior Sum+ Exterior Sum

What is the interior angle sum in any triangle?

• 90°

• 180°

• 45°

Classify the triangles by angles.

a

b

c

Right

Obtuse

Acute

Classify the triangles by sides.

a

b

c

Isosceles

Scalene

Equilateral

Angle classification: ​ (a)  

Side classification: ​ (b)  

• Acute
• Right
• Obtuse
• Equilateral
• Scalene
• Isosceles

Classify this triangle by angles and by sides.

• Acute Scalene

• Obtuse Scalene

• Right Isosceles

• Acute Equilateral

Find the measure of the missing angle.

• 90^o
• 10⁰
• 130^o
• 50^o

Find the measure of the indicated angle. 

• 26°

• 36°

• 85°

• 144°

Solve for the missing angle with the question mark. 

• A
• B
• C
• D

What is the measure of the missing angle?

• 82°

• 43°

• 55°

• 180°

What is the missing angle ?

• 85°

• 78°

• 95°

• 110°