Triangle Sum Theorem

Triangle Sum Theorem

Lesson follows Flocabulary Types of Triangles Video

Poll

How do you feel about your knowledge of triangles?

• Excellent

• Good

• Fair

• Umm..what are triangles?

We will now watch a video on Types of Triangles

Flocabulary.com

Open Ended

What is a triangle?

Open Ended

What are the two ways to classify a triangle?

Fill in the Blank

An angle is where ______.

Fill in the Blank

What are angles measured in?

Open Ended

What is an acute triangle?

Multiple Choice

What kind of triangle has one angle that's more than 90 degrees?

• Equilateral

• Acute

• Right

• Obtuse

Fill in the Blank

What is the longest side of a triangle always opposite?

Multiple Choice

What is a 90-degree angle called?

• Equilateral angle

• Acute angle

• Right angle

• Obtuse angle

Multiple Choice

What shape indicates a right triangle?

• small circle in the corner

• small triangle in the corner

• small square in the corner

• small parallelogram in the corner

Vocabulary Review

Pay attention to visuals and details

Multiple Choice

What is the measure of angle A?

• $15\degree$
  

• $30\degree$
  

• $40\degree$

• $-40\degree$

Multiple Choice

Which of the following triangles is an isosceles triangle?

• A

• B

• C

• D

Multiple Choice

Chila is measuring a triangle. First, she measures the triangle's angles. Each of the triangle's angles is 60 degrees. Next, she measures its sides. Side A is 6 cm long. Side B is also 6 cm long. What is the length of side C?

• 4 cm

• 6 cm

• 8 cm

• 10 cm

Multiple Choice

Which of the following triangles is a right triangle?

• A

• B

• C

• D

Multiple Choice

What is true of the triangle below?

• A: Two of the sides are equal.

• B:All three of the sides are equal.

• C: All three of the angles are equal.

• D: All three sides are different lengths.