66 trapezoids and kites - pc\|macimages.pcmac.org/sisfiles/schools/al/dalevillecs/...geo 6 6 lesson...

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Geo 66 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 237:07 AM 66 Trapezoids and Kites Learning Targets: I can apply properties of trapezoids I can apply properties of kites What characteristic differentiates a trapezoid from a parallelogram? Why would a vaulting horse shaped like a trapezoid be more stable than one that is shaped like a rectangle? Look at the illustration of the four staked vaulting boxes. What conjectures can you make about the angles of the trapezoids that form the end of the box? Feb 511:37 AM

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Page 1: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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February 09, 2016

Jan 23­7:07 AM

6­6 Trapezoids and Kites

Learning Targets:I can apply properties of trapezoidsI can apply properties of kites

What characteristic differentiates a trapezoid from a parallelogram?

Why would a vaulting horse shaped like a trapezoid be more stable than one that is shaped like a rectangle?

Look at the illustration of the four staked vaulting boxes. What conjectures can you make about the angles of the trapezoids that form the end of the box?

Feb 5­11:37 AM

Page 2: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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Feb 5­11:47 AM

Jan 23­7:17 AM

Trapezoid: a quadrilateral with exactly one pair of parallel sides.

Bases: the parallel sidesLegs: the nonparallel sidesBase angles: formed by the base and the one 

of the legs

Isosceles trapezoid: a trapezoid that has congruent legs

Page 3: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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February 09, 2016

Jan 23­7:27 AM

Jan 23­7:30 AM

Page 4: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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Jan 23­7:35 AM

Example 1:

Each side of the basket shown is an isosceles trapezoid. If m<JML = 130, KN = 6.7 feet, and MN = 3.6 feet, find each measure.

1. m<MJK

2. JL

Page 5: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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To save space at a square table, cafeteria trays often incorporate trapezoids into their design. If WXYZ is an isosceles trapezoid and m<YZW = 45, WV = 15 centimeters, and VY = 10 centimeters, find each measure.

3. m< XWZ

4. m<WXY

5. XZ

6. XV

Jan 23­7:47 AM

Page 6: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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February 09, 2016

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Example 2:

7. Quadrilateral ABCD has vertices A(5, 1), B(­3, ­1), C(­2, 3), D(2, 4). Show that ABCD is a trapezoid and determine whether it is an isosceles trapezoid.

Jan 23­7:55 AM

8. Quadrilateral QRST has vertices Q(­8, ­4), R(0, 8), S(6, 8), T(­6, ­10). Show that QRST is a trapezoid and determine whether QRST is an isosceles trapezoid.

Page 7: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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Midsegment of a trapezoid: the segment that connects the midpoints of the legs of the trapezoid.

Jan 23­8:08 AM

Page 8: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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Example 3: 

9. In the figure, MN is the midsegment of trapezoid FGJK. What is the value of x?

Jan 23­8:19 AM

10. Trapezoid ABCD is shown. If FG is parallel to AD, what is the x­coordinate of point G?

Page 9: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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Kite: a quadrilateral with exactly two pairs of consecutive congruent sides.

Opposite sides of a kite are not congruent or parallel.

Jan 23­8:26 AM

Page 10: 66 Trapezoids and Kites - PC\|MACimages.pcmac.org/SiSFiles/Schools/AL/DalevilleCS/...Geo 6 6 Lesson with notes 3rd b.notebook 1 February 09, 2016 Jan 23 7:07 AM 6 6 Trapezoids and

Geo 6­6 Lesson with notes 3rd b.notebook

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Example 4:

11. If WXYZ is a kite, find m<XYZ.

12. If MNPQ is a kite, find NP.

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Geo 6­6 Lesson with notes 3rd b.notebook

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13. If m<BAD = 38 and m<BCD = 50, find m<ADC.

14. If BT = 5 and TC = 8, find CD.