Page 138 - Math Genius C4

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Given below are some polygons.
Triangle Quadrilateral Pentagon

A A E
B
A D

B C D C B Pentagon C
Triangle Quadrilateral
A triangle is a 3-sided polygon. A quadrilateral is a 4-sided A pentagon is a 5-sided polygon.
In triangle ABC, the 3 sides polygon. In quadrilateral ABCD, In pentagon ABCDE, the 5
are: AB, BC, CA the 4 sides are: AB, BC, CD, DA sides are: AB, BC, CD, DE, EA

activity Creative Thinking
Take a 7-piece tangram and make different types of polygons using 3 4

its pieces. For example, a hexagon (6-sided polygon) is shown here. 6
7 5 2
2 6 5
3 1
1 4 7

Practice time 7c

1. Draw an open and a closed figure in your notebook.

2. Identify the simple closed figures.

(a) (b) (c) (d)

(e) (f) (g) (h)

3. Identify the polygons in the following figures.

(a) (b) (c) (d)

(e) (f) (g) (h)

4. Name the sides of the following polygons.

(a) A B (b) X (c) M N (d) A

B E

Y
D C Z O
P C D
Teacher’s Explain to students that a 4-sided polygon is called a quadrilateral. So, a rectangle and a square are
Tip quadrilaterals because they have 4 sides.

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