parallelograms unit 8.2. what is a parallelogram definition: a parallelogram is a quadrilateral with...
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Parallelograms
Unit 8.2
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What is a parallelogram
• Definition: a parallelogram is a quadrilateral with both pairs of opposite sides parallel.
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Properties of a Parallelogram
1. Opposite sides of a parallelogram are congruent
2. Opposite angles in a parallelogram are congruent
3. Consecutive angles in a parallelogram are supplementary
4. If a parallelogram has one right angle, it has four right angles
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Page 413 Example 2
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Problems 7 – 12 Page 414
• 7. 100
• 8. 80
• 9. 80
• 10. 30
• 11. 3a = 21; a = 7
• 12 2b + 3 = 45; b = 21
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Properties of diagonals
• 1. diagonals of a parallelogram bisect each other
• 2. each diagonal of a parallelogram separates the parallelogram into two congruent triangles
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Unit 8.2 Problems
Page 414-5
Problems 7 – 12, 16 – 31, 35, 36
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Tests for Parallelograms
Unit 8.3
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Four Tests
1. If both pairs of opposite sides of a quadrilateral are congruent
2. If both pairs of opposite angles of a quadrilateral are congruent
3. If the diagonals of a quadrilateral bisect each other
4. If one pair of opposite sides of a quadrilateral is both parallel and congruent (new)
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Problems
• Problems 4 – 7 page 4214. No – one pair of opposite sides are not parallel
and congruent5. Yes: Opposite angles are congruent6. 5y = 2y + 12 3x – 18 = 2x - 5 3y = 12 → y = 4 x = 137. 3x – 17 = 2x + 24 5y – 6 = y + 58 x = 41 4y = 64
y = 16
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Homework Unit 8.3
• Page 421-2 Problems 4 – 7, 13 – 18,
19 – 24, 37