M A T H E M A T I C S

4

Modified In-School Off-School Approach Modules (MISOSA)

Distance Education for Elementary Schools

SELF-INSTRUCTIONAL MATERIALS

KINDS OF PLANE FIGURES

Department of Education

BUREAU OF ELEMENTARY EDUCATION 2nd Floor Bonifacio Building DepEd Complex, Meralco Avenue Pasig City

Revised 2010 by the Learning Resource Management and Development System (LRMDS),

DepEd - Division of Negros Occidental under the Strengthening the Implementation of Basic Education

in Selected Provinces in the Visayas (STRIVE).

This edition has been revised with permission for online distribution through the Learning Resource Management Development System (LRMDS) Portal (http://lrmds.deped.gov.ph/) under Project STRIVE for BESRA, a project supported by AusAID.

Section 9 of Presidential Decree No. 49 provides: No copyright shall subsist in any work of the Government of the Republic of the Philippines. However, prior approval of the government agency or office wherein the work is created shall be necessary for exploitation of such work for profit. This material was originally produced by the Bureau of Elementary Education of the Department of Education, Republic of the Philippines.

1

KINDS OF PLANE FIGURES

Objective: Identify the different kinds of plane figures.

Have you gone to the city? Or, have you read stories about the life in the city? Read this story.

Can you name the shapes of the different signboards they have seen? Do the shapes have meanings? Is there a need to have some signboards on the street? Why? Do we need to follow these signs?

Lucia and Gary went to visit their uncle and cousins in the city. When they arrived at the city proper, they saw signs like the following:

SCHOOL CROSSING

STOP

ONE WAY BUS STOP

Review

2

Look at the plane figures below. Count the sides each figure has.

rhombus parallelogram square

trapezoid rectangle

triangles quadrilateral

pentagon hexagon heptagon octagon

nonagon decagon circle The figures above are called plane figures because they have no thickness. A plane is a mathematical term for a flat surface and takes any of the geometric plane shapes like a circle or any in the family of simple closed shapes made up of segments called polygons. A polygon is a closed plane figure formed by line segments.

Study and Learn

3

If polygons are closed plane figure, what could be the least number of lines that determine a polygon?

Polygons are named according to the number of sides or angles they have. The number of side is equal to the number of angles. Triangles have three sides. Quadrilaterals ( square, rectangle, rhombus, parallelogram, trapezoid) have four sides. Pentagons have five sides.

How many sides does a nonagon have? How about octagon? How about a circle? How many sides does it have? Is it a polygon?

Write A inside the figure with 3 sides, B inside the figure with no sides, C inside

the figure with 4 sides and D with more than 4 sides.

Try These

4

Identify the different figures and count how many.

On Your Own

Wrap Up

Plane figures are figures that have no thickness. It includes the geometric plane shapes like a circle or any in the family of simple closed shapes made up of segments called polygons.

5

Check your answer with the answer key. If you get. 8-10 - Excellent! You may now proceed to the next lesson. 5-7 - You need to review the processes you missed. 0-4 - You need to repeat the whole process. Ask your

teacher or elder to help you.

44 - Cover44 - KINDS OF PLANE FIGURESONE WAYSTOPBUSSTOP