Classifying Quadrilaterals

Ch. 14 Math Lessons 8-9

Triangles and Quadrilaterals

Multiple Choice

What type of angle is this? 

• acute
• obtuse
• right
• big

Multiple Choice

What type of angle is shown?

• acute
• obtuse
• right
• straight

Multiple Choice

Classify this triangle by its angles

• Acute

• Obtuse

• Right

Multiple Choice

Classify this triangle by its angles

• Acute

• Right

• Obtuse

Multiple Choice

Classify the triangle by its angles

• Right triangle

• Acute triangle

• Obtuse triangle

Multiple Choice

• acute

• obtuse

• right

Multiple Choice

• acute

• obtuse

• right

Multiple Choice

• acute

• obtuse

• right

Quadrilaterals

• All quadrilaterals have four sides and four angles

• A rectangle, square, and rhombus all have the characteristics of a parallelogram, so they are also parallelograms

Classify the quadrilateral in as many ways as possible

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Does the shape have opposite sides that are equal in length and parallel?

• yes

• So it is a parallelogram

Does the shape have opposite sides that are equal in length and parallel? Does it also have 4 right angles?

• yes

• So it is a rectangle

Does the shape have opposite sides that are equal in length and parallel? Are all four sides equal?

• yes

• So it is a rhombus

Does the shape have opposite sides that are equal in length and parallel? Are all four sides equal? Does it have 4 square angles?

• yes

• So it is a square

Does the shape have exactly one set of parallel sides?

• no

• So it is not a trapezoid

We can classify this shape as:

• a parallelogram

• a rectangle

• a rhombus

• a square

Multiple Choice

A quadrilateral has...

• 5 sides

• 6 sides

• 3 sides

• 4 sides

Multiple Choice

Which shape is NOT an example of a quadrilateral?

Multiple Choice

a rhombus is a quadrilateral with...

• 1 pair of parallel sides

• 2 pairs of parallel sides AND 4 equal sides

• 2 pairs of parallel lines

• 4 equal sides

Multiple Choice

A rectangle is a quadrilateral with...

• 4 equal sides

• 2 pairs of parallel sides

• 4 right angles AND two pairs of parallel lines

• 4 right angles

Multiple Choice

A parallelogram is a quadrilateral with...

• 2 pairs of parallel sides

• 1 pair of parallel sides

• 4 right angles

• 4 equal sides

Multiple Choice

a trapezoid is a quadrilateral with...

• 2 pairs of parallel sides

• 4 right angles

• 4 equal sides

• 1 pair of parallel sides

Multiple Choice

What is this object?

• square

• rhombus

• parallelogram

• trapezoid

Multiple Choice

What is this object?

• rectangle

• rhombus

• parallelogram

• trapezoid

Multiple Choice

What is this object?

• rectangle

• rhombus

• parallelogram

• trapezoid

Multiple Choice

Give the specific name for this quadrilateral

• rectangle

• square

• rhombus

• trapezoid

Multiple Choice

Give the specific name for this quadrilateral

• rectangle

• trapezoid

• parallelogram

• square