Triangle Classification and Angle Measures

Front

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

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

Define an isosceles triangle.

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

Classify a triangle with one angle measuring more than 90 degrees.

Back

This triangle is classified as an obtuse triangle.

Front

If two angles of a triangle are equal, what can be said about the sides opposite those angles?

Back

The sides opposite the equal angles are also equal in length.

Front

What is the measure of an acute angle?

Back

An acute angle measures less than 90 degrees.

Front

In triangle ABC, if ∠A = 50° and ∠B = 60°, what is the measure of ∠C?

Back

∠C = 70° (since the sum of angles in a triangle is 180°).

Front

What is the definition of an equiangular triangle?

Back

An equiangular triangle is a triangle in which all three angles are equal, each measuring 60 degrees.

Front

If the angles of a triangle are in the ratio 2:3:4, what are the measures of the angles?

Back

The angles measure 40°, 60°, and 80°.

Front

What is the relationship between the sides and angles in a triangle?

Back

In a triangle, the larger the angle, the longer the side opposite that angle.