Triangle Sum Theorem and Classifying Triangles

Word Cloud

In 1-2 words, how would you describe your Thanksgiving Break?

Triangle Angle Sum Theorem

Multiple Choice

The Triangle Sum Theorem states that the sum of all angles in a triangle is ______.

• 45°

• 90°

• 180°

• 360°

Find Missing Angle

Step 1: Write as a SUM of 180

Step 2: Plug In and SOLVE

Ex: a + b + c = 180

a = 120

b = 34

120 + 34 + c = 180

154 + c = 180

c = 26 Degrees

Multiple Choice

Find the measure of the indicated angle. 

• 95
• 85
• 35
• 45

Multiple Choice

What is the measure of angle C in the given triangle

if m∠A = 30 and  m∠B = 70; what is m∠C ??

• 50 degrees

• 60 degrees

• 70 degrees

• 80 degrees

Multiple Choice

Find the measure of the missing angle.

• 90^o
• 10⁰
• 130^o
• 50^o

​Classifying Triangles
by their angles

Multiple Choice

Which triangle is an acute triangle?

Multiple Choice

Which triangle is an obtuse triangle?

Multiple Choice

Which triangle is a right triangle?

Classifying Triangles

By their Sides

Multiple Choice

Which triangle is an equilateral triangle?

Multiple Choice

Which triangle is an scalene triangle?

Multiple Choice

Which triangle is an isosceles triangle?

​Now its YOUR TURN....

Complete the remainder of the questions by yourself. Use your whiteboard to work out the problems.

Match

Match the following triangles with their side classification.

Equilateral Triangle

Scalene Triangle

Isosceles Triangle

• Equilateral Triangle

• Scalene Triangle

• Isosceles Triangle

Match

Match the following triangles with their angle classification.

Right Triangle

Acute Triangle

Obtuse Triangle

• Right Triangle

• Acute Triangle

• Obtuse Triangle

Multiple Choice

Classify the triangle based on its sides.

• scalene

• isosceles

• equilateral

Multiple Choice

Classify the triangle based on its sides.

• scalene

• isosceles

• equilateral

Multiple Choice

Classify the triangle based on its sides.

• scalene

• isosceles

• equilateral

Multiple Select

What types of triangles describe the kind of SIDES a triangle has? Pick all that apply.

• Right

• Equilateral

• Isosceles

• Obtuse

• Scalene

Multiple Select

What types of triangles describe the kind of ANGLES a triangle has? Pick all that apply.

• Right

• Equilateral

• Acute

• Obtuse

• Scalene

Multiple Choice

What is the measure of the missing angle?

• 82

• 43

• 55

• 180

Multiple Choice

Max cut out a triangle to use in his collage. One angle measured 46° and another measured 67°. What was the measure of the third angle?

• A

• B

• C

• D