Triangle Angle Sum Theorem & Exterior Angle Theorem

What is the sum of the interior angles of a triangle?

• 90

• 270

• 360

• 180

Tags

CCSS.8.G.A.5

If one angle of a triangle measures 60 degrees and another angle measures 80 degrees, what is the measure of the third angle?

• 90

• 50

• 70

• 40

Tags

CCSS.8.G.A.5

If one exterior angle of a triangle measures 120 degrees, what is the measure of the adjacent interior angle?

• 90

• 30

• 60

• 120

Tags

CCSS.8.G.A.5

What is the measure of each interior angle of an equilateral triangle?

• 60 degrees

• 120 degrees

• 90 degrees

• 30 degrees

Tags

CCSS.8.G.A.5

If one angle of a triangle measures 45 degrees and another angle measures 75 degrees, what is the measure of the third angle?

• 60

• 120

• 90

• 30

Tags

CCSS.8.G.A.5

True or False: The sum of the interior angles of a triangle is always 180 degrees.

• False

• 360 degrees

• 90 degrees

• True

Tags

CCSS.8.G.A.5

If the exterior angle of a triangle measures 40 degrees, what is the sum of the remote two interior angles?

• 100 degrees

• 40 degrees

• 60 degrees

• 140 degrees

Tags

CCSS.8.G.A.5

If one angle of a triangle measures 90 degrees and another angle measures 45 degrees, what is the measure of the third angle?

• 30

• 60

• 90

• 45

An exterior angle of a triangle is 50˚ and one of the remote interior angles is 32˚. What is the measure of the other remote interior angle? _______ degrees (Just input the number)

Mathematical Equivalence

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What is the third angle of a triangle whose 1st angle is 34 and 2nd angle is 101?

• 32
• 39
• 45
• 54

Tags

CCSS.8.G.A.5