Angles and Triangles 2025

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle in which all three sides are of different lengths and all three angles are of different measures.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is the total sum of the angles in a triangle?

Back

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

Front

What is the measure of an angle that is less than 90 degrees?

Back

An angle that is less than 90 degrees is called an acute angle.

Front

What is the measure of an angle that is greater than 90 degrees but less than 180 degrees?

Back

An angle that is greater than 90 degrees but less than 180 degrees is called an obtuse angle.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle measuring exactly 90 degrees.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle in which all three sides are of equal length and all three angles are equal, each measuring 60 degrees.

Front

What is an isosceles triangle?

Back

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

Front

What is the measure of a right angle?

Back

A right angle measures exactly 90 degrees.

Front

What is the measure of a straight angle?

Back

A straight angle measures exactly 180 degrees.