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4. By using protractor, determine which of the angle in each of the following pairs is
greater. Also, classify whether it is acute, right, obtuse, straight or reflex angles.

(a) A D (b) D

A B C E F
B C E F
(c) A (d)
Z
N Q

M O P R
B C X Y

POLYGON

A closed figure made up of three or more line segments that do not cross each other is
called a polygon. Look at the following figures.

Polygons are given special names depending on the number of sides they have.

Some names of the polygons are as follows:
Polygon Number of Sides Name of the Polygon

3 Triangle

4 Quadrilateral

5 Pentagon

6 Hexagon

7 Heptagon

8 Octagon

9 Nonagon

10 Decagon

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