Bake Sale

• Cara, Nick, and Tammy had 96 cookies (8 dozen) to sell at a bake sale.

• Tammy sold 32 cookies.

• Nick sold as many cookies as Tammy sold plus 5 more.

• Cara sold 10 fewer cookies than Tammy sold.

• How many cookies did they have left?

• They had 5 cookies left.

Bake Sale

Quadrilaterals

Lesson 10-5

Identify and Classify Quadrilaterals

Quadrilateral

• A closed figure with four sides and four angles.

• Quadrilaterals are named based on their sides and angles.

• The diagram shows how the quadrilaterals are related.

Quadrilateral

Parallelogram

A quadrilateral with opposite sides parallel and opposite sides congruent.

Means parallel

Means congruent

Rectangle

A parallelogram with 4 right angles.

Rhombus

A parallelogram with 4 congruent sides.

Square

A parallelogram with 4 right angles and 4 congruent sides.

Trapezoid

A Quadrilateral with one pair of parallel sides.

Quadrilateral

Parallelogram

RhombusRectangle

Square

Trapezoid

Measure of a Quadrilateral

AB

•A Quadrilateral can be separated into 2 triangles. Since the sum of the measure of each triangle is 180° then the sum of the measure of both triangles is 180 +180 = 360°

•The sum of the measure of the angles of a quadrilateral is 360°

Find the measure of the missing angle.

73°59°

85° x°

•85 + 73 + 59 =

• 217

•360 – 217 =

• x = 143°

Concept Check

• Explain why all squares are rectangles but not all rectangles are squares?

Concept Check

• A quadrilateral is a trapezoid.

• Always

• Sometimes

• Never

Concept Check

• A quadrilateral is a trapezoid.

• Always

• Sometimes

• Never

Concept Check

• A parallelogram is a rectangle.

• Always

• Sometimes

• Never

Concept Check

• A parallelogram is a rectangle.

• Always

• Sometimes

• Never

Concept Check

• A trapezoid is a parallelogram.

• Always

• Sometimes

• Never

Concept Check

• A trapezoid is a parallelogram.

• Always

• Sometimes

• Never

Practice Work

• Lesson 10-5 pg 435 - 436

• # 4 – 24 all

Homework/Wrap-up

• Complete Lesson 10-5 # 1-15 all