Basic Geometry

Front

How many sides does an octagon have?

Back

An octagon has 8 sides.

Front

What does it mean for lines to be perpendicular?

Back

Perpendicular lines intersect at 90 degrees.

Front

What angle is less than 90 degrees?

Back

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

Front

Which angle is greater than 90 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 angle is exactly 90 degrees?

Back

An angle that is exactly 90 degrees is called a right angle.

Front

What is a triangle?

Back

A triangle is a shape with 3 sides and 3 angles.

Front

What is a quadrilateral?

Back

A quadrilateral is a shape with 4 sides.

Front

What is a circle?

Back

A circle is a round shape with no corners and all points are the same distance from the center.

Front

What is the sum of the angles in a triangle?

Back

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

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle equal to 90 degrees.