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A DETAILED LESSON PLAN IN MATHEMATICS V
I.
OBJECTIVES 1.
Solve for the Perimeter of the given polygon.
2.
Use appropriate formula in finding the perimeter of a polygon.
3.
Show enthusiasm in performing any assigned task.
4.
Appreciate the value of sportsmanship in any competition. VALUES: Cooperation and Accuracy
II.
SUBJECT MATTER “ Perimeter Perimeter of Polygons” Polygons” Reference: PELC A.3.3.1 Grade School Mathematics 5, pp. 224-225 Materials: Tape measure, cut outs of polygons polygons using styro, chart, flashcards flashcards
III.
PROCEDURES Teacher’s Activity A. Preliminary Activities 1. Song: Let us sing the song “ Learning Math”
Pupil’s Activity
“LEARNING MATH” Learning Math is really fun New ideas every time There’s a lot for everyone Problem solving satisfied We are glad, we are glad For the problem makes us wise.
2. Drill: Tell whether the angle is acute, right, obtuse, reflex or straight.
It is an acute angle.
It is an obtuse angle.
3. Review: What do we call a polygon with three sides? Correct! How about a polygon with four sides? Good ! Another Right! How many side does a pentagon has? Very good! How about a polygon with six sides? That’s right! A. Developmental Activities 1. Motivation: I have here a tape measure, now I will measure the sides of this shape. What shape is this? If I measure and add all the sides of this object, what do you think I am looking for? Is it area, perimeter or volume?
2. Presentation: Louisa has a squared box. She needs to put an exact ribbonette around the sides of the box. Each side measures 12.5 cm. How long is the ribbonette that she needs? Kindly read the story problem.
It is a straight angle.
It is a right angle.
A polygon with three sides is a tr iangle.
A polygon with four sides is a square.
A rectangle is also a polygon with four sides. A pentagon has five sides.
A polygon with six sides is a hexagon.
Louisa has a squared box. She needs to put an exact ribbonette around the sides of the box. Each side measures 12.5 cm. How long is the ribbonette that she needs?
What is the shape of the box? Yes, the shape of the box is square. The square has four equal sides. What is the measure of each side? Now, we need to add the t he four sides. So that we can get the ribbonette that we need.
So, how long does the robbonette Louisa need? Yes, she needs 50cm. the way we add the four sides of the square is what we call PERIMETER. Now, what do we mean by the word PERIMETER? Very good! The distance around of any polygon is called perimeter. It is found by adding all sides of the polygon. The general formula for the perimeter is……… P = S1 + S2 +S3 +………….Sn
Here is another way of finding the perimeter of polygon by using formulas.
