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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 Review
Quadrilateral NOT a Quadrilateral
A quadrilateral is a polygon with 4 sides and 4 angles.
Let’s ReviewCore LessonThere are two main
kinds of quadrilaterals
2 Sets of Parallel Sides
1 or less sets ofparallel sides
rectangle
square
parallelogram
rhombusnon-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 Mistake
Trying 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
XX3 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 Practice
Anthony 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?