Side Lengths and Angles in Triangles

The sum of the interior angles in a triangle is ...

• 360 degrees

• 180 degrees

• 90 degrees

• 540 degrees

Equilateral triangles ...

• have three angles that are the same measure

• have three side lengths that are the same measure

• have only acute angles

• have three angles that are each 60 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

Scalene triangles ...

• have three different angle mesures

• have two side lengths that are congruent

• have three different side lengths

• always have one right angle

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

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