6 Form PACE WORK 27/04/20

6 Form PACE WORK 27/04/20

Тема: П’ятикутник

In t                              

- What geometric figures do you know?

- Draw them.

1. Circle

2. Line

3. Rectangle

4. Triangle

5. Square

IV. Основна частина уроку.

4.1. Revision.

Is it a Pentagon?

A pentagon has 5 straight sides. The shape must also be closed (all the lines connect up):

A pentagon is a 5-sided Polygon (a flat shape with straight sides):

Regular or Irregular

When all angles are equal and all sides are equal it is regular, otherwise it is irregular:

   regular              irregular

 Concave or Convex

A convex pentagon has no angles pointing inwards. More precisely, no internal angles can be more than 180°.

When any internal angle is greater than 180° it is concave. (Think: concave has a "cave" in it)    

Properties

A regular pentagon has:Interior Angles of 108°

Exterior Angles of 72°

Area of approximately 1.7204774 × s2 (where s=side length)

Draw a regular pentagon.

Draw an irregular pentagon.