Classify 2-D Shapes by Angles and Lines

Front

What is a trapezoid?

Back

A trapezoid is a 2-D shape that has one pair of parallel sides.

Front

How many acute angles can a trapezoid have?

Back

A trapezoid can have one or more acute angles.

Front

What is an obtuse angle?

Back

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

Front

How many obtuse angles can a triangle have?

Back

A triangle can have at most one obtuse angle.

Front

What defines a parallelogram?

Back

A parallelogram is defined by having two sets of parallel sides.

Front

How many sets of parallel lines does a rectangle have?

Back

A rectangle has exactly two pairs of parallel sides.

Front

What is the difference between acute and obtuse angles?

Back

Acute angles are less than 90 degrees, while obtuse angles are greater than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

Can a shape have both acute and obtuse angles?

Back

Yes, a shape can have both acute and obtuse angles, such as a quadrilateral.

Front

What is a polygon?

Back

A polygon is a closed 2-D shape with straight sides.