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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?

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They had 5 cookies left. Bake Sale

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Quadrilaterals Lesson 10-5 Identify and Classify Quadrilaterals

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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.

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Parallelogram A quadrilateral with opposite sides parallel and opposite sides congruent. Means parallel Means congruent

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Rectangle A parallelogram with 4 right angles.

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Rhombus A parallelogram with 4 congruent sides.

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Square A parallelogram with 4 right angles and 4 congruent sides.

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Trapezoid A Quadrilateral with one pair of parallel sides.

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Quadrilateral Parallelogram Rhombus Rectangle Square Trapezoid

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Measure of a Quadrilateral A B 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°

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Find the measure of the missing angle. 73° 59° 85°x° 85 + 73 + 59 = 217 360 – 217 = x = 143°

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Concept Check Explain why all squares are rectangles but not all rectangles are squares?

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Concept Check A quadrilateral is a trapezoid. Always Sometimes Never

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Concept Check A quadrilateral is a trapezoid. Always Sometimes Never

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Concept Check A parallelogram is a rectangle. Always Sometimes Never

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Concept Check A parallelogram is a rectangle. Always Sometimes Never

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Concept Check A trapezoid is a parallelogram. Always Sometimes Never

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Concept Check A trapezoid is a parallelogram. Always Sometimes Never

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Practice Work Lesson 10-5 pg 435 - 436 # 4 – 24 all

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Homework/Wrap-up Complete Lesson 10-5 # 1-15 all

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Quadrilaterals Four sided polygons.

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