5.1 Angles of Triangles

Front

What is an equilateral triangle?

Back

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

Front

What is an obtuse triangle?

Back

A triangle that has one angle greater than 90 degrees.

Front

What is an acute triangle?

Back

A triangle that has all three angles less than 90 degrees.

Front

What is a right triangle?

Back

A triangle that has one angle equal to 90 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 of equal length and at least two angles of equal measure.

Front

What is the sum of the angles in a triangle?

Back

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

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

If a triangle has angles measuring 30 degrees, 60 degrees, and 90 degrees, what type of triangle is it?

Back

It is an acute triangle.

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.