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Lesson 5.10 Page 317

Lesson 5.10 Page 317. Properties of Rhombuses, Rectangles, and Squares. What is a rhombus?. A rhombus is a parallelogram with four congruent sides. Is a square a rhombus? When is a rhombus not a square?. What is a rectangle?. A rectangle is a parallelogram with four right angles.

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Lesson 5.10 Page 317

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  1. Lesson 5.10Page 317 Properties of Rhombuses, Rectangles, and Squares

  2. What is a rhombus? • A rhombus is a parallelogram with four congruent sides. • Is a square a rhombus? • When is a rhombus not a square?

  3. What is a rectangle? • A rectangle is a parallelogram with four right angles. • Is a square a rectangle? • When is a rectangle not a square?

  4. Recall the biconditional If and only if • A polygon is a triangle if and only if the angle sum is 180°. • Is the same as saying two things at once: • If a polygon has an angle sum of 180°, then it is a triangle. • If a polygon is a triangle then it has an angle sum of 180°.

  5. What if you combined the two? Rhombus Rectangle Equilateral Equiangular Square Regular

  6. Example 1a • For a rhombus ABCD, decide whether the statement is always, sometimes, or never true. AB > BC • A rhombus is a parallelogram with four congruent sides. B A So AB = BC and the statement is never true First make a drawing and label it. D C

  7. Reminders: • Bring your book everyday until the Unit 3B Test on Tuesday, February 3rd. • We will have a Quiz on Friday, January 30th. • Go to the Media Center on Monday and Tuesday for the Midterm Test!

  8. Homework Assignment Lesson 5.10 Page 319 # 1-27 odd Due on Wednesday!

  9. Parallelogram Rhombus Rectangle Square

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