1 / 12

Geometry Notes

Geometry Notes. Section 1-6. What you’ll learn. How to identify and name polygons Find perimeters of polygons. Vocabulary. Polygon Concave Convex n -gon Regular polygon perimeter. Polygons. Examples. Non examples:. DEFN: POLYGON. To name a polygon, list consecutive vertices.

wing-burns
Download Presentation

Geometry Notes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Geometry Notes Section 1-6

  2. What you’ll learn. . . • How to identify and name polygons • Find perimeters of polygons

  3. Vocabulary • Polygon • Concave • Convex • n-gon • Regular polygon • perimeter

  4. Polygons • Examples • Non examples:

  5. DEFN: POLYGON To name a polygon, list consecutive vertices • A polygon is • a closed figure in a plane • formed by connecting line segments endpoint to endpoint (these line segments only intersect the other line segments at the endpoints) Consecutive sides E • Parts of Polygons • Each line segment is a called a SIDE • Each endpt where sides meet is a VERTEX • Diagonal • Interior • Exterior P N Diagonal Consecutive Vertices Consecutive Angles T A The name of this pentagon is PENTA.

  6. Convex vs. Concave Polygons • Convex Polygons: • A polygon is convex if no diagonal is outside the polygon • Concave Polygons: • A polygon is concave if at least onediagonal is outside the polygon

  7. Names of Polygons

  8. DEFN: Regular Polygon • A polygon is regular if . . . • It is convex • It is equilateral Not Equilateral or Equiangular Not!! Not!! Not Equilateral Regular or Not? Regular or Not? YES  Regular or Not? • It is equiangular • Equilateral – all sides are the same length • Equiangular – all angles are the same measure

  9. DEFN: Perimeter of a Polygon • Find the perimeter of PENTA. • The perimeter of a polygon is the sum of all sides. Bet you’ve never heard that one before N 6 in 6 in E T 5 in 5 in P A 7 in • Perimeter = 5+6+6++5+7=29 inches

  10. Perimeter revisited… • To find perimeter for a polygon in a coordinate plane • Remember, perimeter is the sum of the lengths of all sides. . . • Find the length (or measure) of each side • You may have to use the distance formula I told you, this formula would be used all year. . .

  11. Example Please say 3, Please say 3 Find the perimeter of PQR if P(-5, 1), Q(-1, 4) and R(-6, -8). Perimeter = sum of all sides How many sides does a triangle have? So we have to find the length of 3 sides. Oh, yes. . . The distance formula—3 times. Find PQ, QR, and PR using the distance formula.

  12. Have you learned. . . • How to identify and name polygons? • Find perimeters of polygons? • Assignment: Worksheet 1.6

More Related