Lesson Plan in Third Year

Geometry

I.                    Objectives:

At the end of the lesson, the third year students with 75% proficiency are expected to;

1.       work in the group the task given;

2.       identify the formula for the area of polygons; and

3.       solve for the area of polygons using the formula.

II.                  Subject Matter:

A.      Topic:

                “Area of Polygons”

B.      Instructional Materials:

              PowerPoint presentation, bond papers, glue, ruler, construction paper, computer

C.      Values:

Unity, Cooperation

D.       References:

                Insigne, L. P. et.al.(2003). Geometry (Based on Basic Education Curriculum).                                        Philippines: Bookman, Inc.

                Acelajado, M. J. et.al. (2003). The New High School Mathematics Third Year                                         (Geometry) Textbook. Philippines: Diwa Scholastic Press Inc.

E.       Source:

http://www.mathsisfun.com/area.html

http://www.mathsteacher.com.au/year8/ch12_area/01_area/area.htm

http://www.mathsteacher.com.au/year8/ch12_area/fig.htm

III.                Strategies:

A.      Engagement:

The students are divided into groups with seven members in each group. Each group is tasked to have cut-outs of one inch by one inch construction papers. They are provided with cut-outs of bond papers with different shapes and sizes. They have to paste their cut-outs construction papers into the entire surface or region of the bond papers provided, which could be either of the two sides (front or back).

B.      Presentation:

The students are asked to count the number of cut-out construction papers pasted on each polygonal shape of bond paper and the teacher would explain that the number of cut-outs corresponds to the area of each polygonal shape of bond paper.

C.      Discussion:

Using the PowerPoint presentation, the teacher presents the easier way of finding the polygons which is using the different formulas for the area of different polygons such as triangle, square, rectangle, etc. The link below is used for easy understanding of the students which also serves as their notes.

Link: http://www.math.com/school/subject3/lessons/S3U2L4GL.html

Various examples are provided in each formula.

A.      Enrichment:

Answer the questions from the link using. Answer only numbers one to five.

Link: http://www.mathopolis.com/questions/q.phpid=1754&site=1&ref=/area.html&qs=154_1755_1756_1757_1758_1759_1760_1761_3250_3251

I.                    Evaluation:

Solve the following problems.

1.       Find the area of a rectangular region bounded by a length of 8 ½ m and a width of 6 m.

2.       One of the equal sides of an isosceles triangle is 5 m long. What is the area of the triangle?

3.       The area of a square is 16 cm². What is its perimeter?

4.       If a rectangle has a height h=(3x-5) cm, base b=(x+10) cm and area equal to 98 cm², find its dimensions.
5. What is the area of the triangle?

II.                  Assignment:

Jolina would like to put new tiles on her kitchen floor. If her rectangular kitchen is 5 m by 3 m, how many tiles should she purchase if each square tile is 20 cm on a side?