Triangle Sum/Exterior Angle Theorem

Let's have a quick review M3!

​MATH CORE CLASS M3 IP

Congruent Triangles - Group sort

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Why do triangles always equal 180^o?

Triangle Sum/Exterior Angle Theorem

​Triangle Angle Sum Theorem

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​The sum of all angles on a triangle is equal to 180 degrees.

​Triangle Exterior Theorem

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​The sum of two opposite interior angle is equal to an exterior angle opposite to it.

Angle Sum and Exterior Angle Theorem of Trinagles - Google Jamboard

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Multiple Choice

What is the measure of the missing angle?

• 82
• 43
• 55
• 180

Multiple Choice

Find the measure of the missing angle.

• 47

• 57

• 53

• 133

Multiple Choice

What is the measure of a third angle in a triangle when the first two angles measure

$$34\degree\ and\ 101\degree$$  ?

• $$32\degree$$  

• $$45\degree$$  

• $$54\degree$$  

• $$39\degree$$  

Multiple Choice

Solve for x.

• 5

• 12

• -7

• -6

Multiple Choice

Solve for x.

• -12

• -8

• -10

• -5

Multiple Choice

Solve for x.

• 16

• 11

• 50

• 6

Multiple Choice

Solve for x

• 28
• 12
• 10
• 2

Exterior Angle Theorem Activity

Multiple Choice

Find the measure of each angle indicated.

• $$50\degree$$

• $$120\degree$$

• $$30\degree$$

• $$20\degree$$

Multiple Choice

What is the measure of x?

• 101°

• 111°

• 121°

• 131°

Multiple Choice

Find the indicated angle measure. 

(What is ?)

• $$5\degree$$

• $$165\degree$$

• $$65\degree$$

• $$60\degree$$

Multiple Choice

Find the indicated angle measure.

(What is ?)

• 85

• 78

• 95

• 110

Multiple Choice

Solve for x

• 3

• 4

• 2

• 1

Multiple Choice

Solve for x

• 48

• 85

• 24

• 9

Multiple Choice

Set up an equation to find x.

• 42 + 8x = 2 + 12x

• 2 + 12x + 42 = 8x

• 42 + 8x + 2 + 12x = 180

• 42 + 8x = 180

Multiple Choice

Which of the following angles are remote interior angles to

$$\angle d$$  ?

• $$\angle a\ and\ \angle b$$  

• $$\angle a\ and\ \angle c$$  

• $$\angle b\ and\ \angle d$$  

• $$\angle a,\ \angle b,\ and\ \angle c$$