1 / 5

11.4 Areas of regular polygons.

11.4 Areas of regular polygons. Central Angle  Angle formed from center of polygon to consecutive vertices. Radius. Apothem  Distance from center of polygon to side. Things to notice, all parts can be found using SOHCAHTOA. It is isosceles, so you can break up the triangle in half.

arvid
Télécharger la présentation

11.4 Areas of regular polygons.

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. 11.4 Areas of regular polygons. Central Angle  Angle formed from center of polygon to consecutive vertices. Radius Apothem  Distance from center of polygon to side. Things to notice, all parts can be found using SOHCAHTOA. It is isosceles, so you can break up the triangle in half.

  2. The area of these 5 triangles is = Or we can think of it as What do you think we can do to find the area of this shape? So you see it’s

  3. Let’s find the area of a pentagon with side length 10 Which trig function do we use to find the apothem? 72o TANGENT! Plug in, be careful with the perimeter! 36o 5 10

  4. 10

  5. R - HW #31: Pg 431: 4—10 even; Pg 443: 1—11 odd, 13—16 all • Quiz Monday • I can give you a rough grade estimate at break or lunch.

More Related