3.1 Classifying Triangles

Front

In an ______________ triangle, all three angles are less than 90 degrees.

Back

acute

Front

If a triangle has all angles less than 90° and two equal sides, what type of triangle is it?

Back

Acute Isosceles

Front

What type of triangle does the picture show?

Back

isosceles

Front

A triangle has angle measurements of 54°, 52°, and 74°. What kind of triangle is it?

Back

acute triangle

Front

Select the obtuse triangle.

Back

An obtuse triangle has one angle greater than 90 degrees.

Front

What is an equilateral triangle?

Back

A triangle with all three sides equal and all angles measuring 60 degrees.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths and all angles of different measures.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides equal and the angles opposite those sides equal.

Front

What is the sum of the angles in a triangle?

Back

180 degrees.

Front

How can you determine if a triangle is acute?

Back

All three angles must be less than 90 degrees.