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Lesson 5: Classifying geometric shapes

Review the following quadrilaterals: parallelogram, trapezoid, rhombus, rectangle, and square.  Then, try some practice problems.

NameDefinitionExample
Parallelogram2 pairs of parallel sides
TrapezoidExactly 1 pair of parallel sides
Rectangle4 right angles
Rhombus4 equal sides
Square4 equal sides and 4 right angles

A quadrilateral is a 4 sided closed figure.
The start color #e84d39, start text, f, i, r, s, t, end text, end color #e84d39 figure is not closed.
The start color #e07d10, start text, s, e, c, o, n, d, end text, end color #e07d10 figure has 5 sides

## Practice set 1: Identifying quadrilaterals

Problem 1A
• Current
Which TWO of the following shapes are quadrilaterals?

### What is a parallelogram?

A parallelogram is a quadrilateral with 2 pairs of parallel sides. In these figures, sides of the same color are parallel to each other.

### Practice set 2: Identifying parallelograms

Problem 2A
• Current
Which TWO of the following shapes are parallelograms?

## What is a trapezoid?

A trapezoid is a quadrilateral with exactly start color #1fab54, 1, start text, space, p, a, i, r, space, o, f, space, p, a, r, a, l, l, e, l, space, s, i, d, e, s, end text, end color #1fab54.
Problem 3A
• Current
Which TWO of the following shapes are trapezoids?

## What is a rectangle?

A rectangle is a quadrilateral with 4 right angles.
Problem 4A
• Current
Which TWO of the following shapes are rectangles?

## What is a rhombus?

A rhombus is a quadrilateral with 4 equal sides.
Problem 5A
• Current
Which TWO of the following shapes are rhombuses?

## What is a square?

A square is a quadrilateral with 4 equal sides and 4 right angles.
Problem 6A
• Current
Which TWO of the following shapes are squares?

## Practice set 7: Pulling it all together

Problem 7A
• Current
All parallelograms have opposite sides that are equal in length and parallel.
Which of these quadrilaterals are parallelograms?
The matching arrow labels indicate that two opposite sides are parallel.

Want to try more problems like this? Check out these exercises: