Triangle Properties

Front

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

Back

180 degrees.

Front

Define an equilateral triangle.

Back

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

Front

What is an acute triangle?

Back

A triangle where all three angles are less than 90 degrees.

Front

What is an obtuse triangle?

Back

A triangle that has one angle greater than 90 degrees.

Front

What is a right triangle?

Back

A triangle that has one angle equal to 90 degrees.

Front

Define a scalene triangle.

Back

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

Front

Define an isosceles triangle.

Back

A triangle with at least two sides of equal length and at least two angles of equal measure.

Front

If two angles of a triangle are 50 degrees and 60 degrees, what is the measure of the third angle?

Back

70 degrees.

Front

What is the relationship between the angles in an equiangular triangle?

Back

All angles are equal and each measures 60 degrees.

Front

How do you find the measure of an unknown angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.