How do you know when a shape is a rhombus?

Are you a rhombus?

Are you a rhombus? Are you a

rhombus?

In this lesson you will learn to identify specific kinds of

quadrilaterals by looking at their attributes.

Let’s ReviewLet’s ReviewQuadrilateral NOT a Quadrilateral

A quadrilateral is a polygon with 4 sides and 4 angles.

Let’s ReviewCore Lesson There are two main kinds of quadrilaterals

2 Sets of Parallel Sides

1 or less sets ofparallel sides

rectangle

square

parallelogram

rhombus non-specificquadrilateral

trapezoid

Let’s ReviewCore Lesson Quadrilaterals with 2 sets of parallel sides:

squarerectangle

parallelogram

rhombus

• 2 sets of parallel sides

• 2 pairs of congruent sides

• 2 sets of parallel sides

• 2 pairs of congruent sides

• 4 right angles• 2 sets of parallel

sides• 4 congruent

sides• 4 right angles• 2 sets of parallel

sides• 4 congruent sides

Let’s ReviewCore Lesson Quadrilaterals with 1 or less sets of parallel sides:

trapezoid

non-specificquadrilateral

isosceles trapezoid

• 1 set of parallel sides

• 1 set of parallel sides

• 1 pair of congruent sides

• 4 sides

Let’s ReviewA Common MistakeTrying to name all unknown

quadrilaterals as parallelograms or trapezoids.

non-specificquadrilateral

Let’s ReviewCore Lesson

Which of these shapes is a rhombus?

A rhombus has:• 2 sets of

parallel sides• 4 congruent

sides

X X3 units

3 units3 units

3 units

In this lesson you have learned to identify specific kinds of quadrilaterals by looking at

their attributes.

Let’s ReviewGuided PracticeAnthony made a frame in art class. The frame has four sides that are two different lengths, and the opposite sides are parallel. The frame has four right angles. Which shape is the frame?

Let’s ReviewExtension Activities

Pick two quadrilaterals. Describe the similarities and differences between the two shapes.

Example:Describe the similarities and differences between a trapezoid and a parallelogram.

Let’s ReviewExtension Activities

Pick a quadrilateral. Draw as many different shapes as you can that could be classified as that quadrilateral.

Example:Draw as many different parallelograms as you can think of.

Let’s ReviewQuick Quiz

Describe how you know when a shape is a rectangle.

Tara was standing in front of her house when she noticed the shape of the attic window. The window had exactly one set of parallel sides. Which polygon is the window shaped like?