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Learn about polygons, their sides, and how to determine if they are convex or concave. Also, find out how to calculate the perimeter using the Distance Formula in the coordinate plane.

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Welcome back!

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Presentation Transcript

  1. Welcome back! • Warm-Up… • Copy down the chart & fillin the number of sides: • Quickwrite… • On a scale of 1 to 5 (5 = Very Good, 1= Very Bad), how would you rate your weekend? Why? • “On a scale of 1 to 5, I would rate my weekend a ___ because ___________________________________.”

  2. Compare & explain… • starting with Student #2 (1 min)

  3. Homework review

  4. Round robin… • starting with the student who woke up the earliest this morning (1 min) • On a scale of 1 to 5 (5 = Very Good, 1 = Very Bad), how would you rate your weekend? Why? • “On a scale of 1 to 5, I would rate my weekend a ___ because ___________________________________.”

  5. Polygons

  6. What is a polygon? • A polygon is a closed plane figure with three or more sides • Each side intersects exactly two sides at the vertex • We can name a polygon by listing the vertices in consecutive order • The number of sides determines the name of a polygon

  7. Convex vs. concave polygons • Convex polygons have NO lines that go through the interior • Concave polygons are the opposite • Convex or concave? • Concave Convex

  8. How do we find the perimeter? • In the coordinate plane we can use the Distance Formula

  9. Example

  10. Solution

  11. Practice

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