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Transparency 5 Click the mouse button or press the Space Bar to display the answers.

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Example 5-3b Objective Identify and classify quadrilaterals

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Example 5-3b Vocabulary Quadrilateral A closed figure having four sides and four angles

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Example 5-3b Vocabulary Parallelogram A quadrilateral with opposite sides parallel and opposite sides congruent

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Example 5-3b Vocabulary Trapezoid A quadrilateral with one pair of parallel sides

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Example 5-3b Vocabulary Rhombus A parallelogram having four congruent sides

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Example 5-3b Vocabulary Parallel Lines that do not intersect Always the same distance between the two lines

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Lesson 5 Contents Example 1Classify Quadrilaterals Example 2Classify Quadrilaterals Example 3Find a Missing Measure

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Example 5-1a Classify the quadrilateral using the name that best describes it. Rectangle The quadrilateral has 4 right angles Opposite sides are congruent 1/3 Meets the definition of a rectangle Answer:

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Example 5-1b Classify the quadrilateral using the name that best describes it. Answer: parallelogram 1/3

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Example 5-2a Classify the quadrilateral using the name that best describes it. Answer: Trapezoid The quadrilateral has one pair of parallel sides 2/3 No congruency symbols No right angles Meets the definition of a trapezoid

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Example 5-2b Classify the quadrilateral using the name that best describes it. Answer: Square 2/3

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Example 5-3a Find the missing angle measure in the quadrilateral. Sum of the angles in a quadrilateral is 360 0 x + 60 0 + 120 0 + 60 0 = 360 0 3/3 Add the 4 angles together

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Example 5-3a Find the missing angle measure in the quadrilateral. x + 60 0 + 120 0 + 60 0 = 360 0 3/3 Bring down x Combine “like” terms x + 240 0 Bring down = 360 0 = 360 0 Ask “what is being done to the variable?” The variable is being added by 240 0 Do the inverse on both sides of the equal sign Bring down x + 240 0 x + 240 0 Subtract 240 0 - 240 0

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Example 5-3a Find the missing angle measure in the quadrilateral. x + 60 0 + 120 0 + 60 0 = 360 0 3/3 x + 240 0 = 360 0 Bring down = 360 0 x + 240 0 Subtract 240 0 - 240 0 = 360 0 - 240 0 Bring down x x Combine “like” terms + 0 0 Bring down = = Combine “like” terms 120 0 Use the Identify Property to add x + 0 0 x = 120 0 Answer:

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Example 5-3b Find the missing angle measure in the quadrilateral. Answer: x = 134 * 3/3

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End of Lesson 5 Assignment Lesson 10:5Quadrilaterals4 - 24 All

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