Geometry Vocabulary

Front

Which of the following is a characteristic of an acute angle?

Back

It measures less than 90 degrees.

Front

An angle with a measure greater than 90 degrees but less than 180 degrees is called an _____________________.

Back

obtuse angle

Front

Points that are at the ends of a line segment are called _____________________________.

Back

endpoints

Front

A part of a line that starts at a point and extends infinitely in one direction is called a __________________.

Back

ray

Front

Which of the following is a property of parallel lines?

Back

They never intersect.

Front

What is the measure of a right angle?

Back

It measures exactly 90 degrees.

Front

A line that intersects another line at a right angle is called a __________________.

Back

perpendicular line

Front

The point where two lines intersect is called a __________________.

Back

vertex

Front

A straight line that extends infinitely in both directions is called a __________________.

Back

line

Front

The distance around a shape is known as its __________________.

Back

perimeter