4th Grade Angles and Lines

Front

What kind of angle is formed by perpendicular lines?

Back

Right angle.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What is a line of symmetry?

Back

A line that divides a figure into two mirror-image halves.

Front

How many lines of symmetry does a square have?

Back

A square has 4 lines of symmetry.

Front

How many lines of symmetry does a rectangle have?

Back

A rectangle has 2 lines of symmetry.

Front

What is a ray in geometry?

Back

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

Front

What is a vertex?

Back

The point where two lines or rays meet to form an angle.

Front

What is a transversal?

Back

A line that crosses at least two other lines.