Classify Triangles, Triangle Sum Theorem, Triangle Inequality Theorem

What is the measure of the missing angle?

• 80

• 60

• 50

• 70

The triangle inequality theorem states that the sum of any two sides must be ________________ the length of the third side.

• less than

• greater than

• equal to

• less than or equal to

The triangle inequality theorem states that the _________ of any two sides must be greater than the length of the third side.

• quotient

• difference

• sum

• product

Three line segments have measures of 12 cm, 7 cm, and 5 cm. Will the segments form a triangle?

• Yes

• No

Three line segments have measures of 9 cm, 5 cm, and 6 cm. Will the segments form a triangle?

• Yes

• No

A triangle has two angles that are 65 degrees and 50 degrees. What must the third angle be?

• 65

• 75

• 25

• 60

The angles inside an equilateral triangle are all ...

• 20 degrees

• 50 degrees

• 60 degrees

• 45 degrees

Isosceles triangles ...

• have three different side lengths

• have two side lengths that are congruent

• have two angles that are congruent

• always have a 90 degree angle

The Triangle Inequality Theorem states the sum of the lengths of any two sides of a triangle is ________________ the length of the third side.

• greater than

• less than 

• equal to

How many triangles can be created with the side lengths of 3 cm, 4cm, and 5 cm?

• Only 1 unique triangle

• multiple triangles

• no triangles