Triangle Sum Theorem and Triangle Inequality Theorem with Angles

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

• 360 degrees

• 180 degrees

• 90 degrees

• 540 degrees

*Select all that apply*

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

The word "congruent" means ...

• obtuse

• different

• acute

• equal

Scalene triangles ...

• have three different angle mesures

• have two side lengths that are congruent

• have three different side lengths

• always have one right angle

• acute

• congruent

• obtuse

• right

Acute triangles have ...

• have one obtuse angle

• three angles that are acute

• one right angle

• have three angles that are less than 90 degrees

A right triangle has ...

• one right angle

• three acute angles

• two right angles

• three obtuse angles

How do you classify this triangle?

• acute

• obtuse

• right

• scalene