Lesson plan in mathematics 9

Find the trigonometric ratios of special triangles

1. GOOD MORNING !!!, HOW IS YOUR DAY? HAVE YOU BEEN ENERGIZE TODAY? HAVE YOU EATEN YOUR BREAKFAST? ARE YOU FEELING OK? “GOD IS GOOD, ALL THE TIME” “ EVERYBODY SAY, ALL IS WELL”

2. ATTENDANCE CHECK GRADE 9 DALTON

3. LESSON PLAN IN MATHEMATICS 9 4 TH QUARTER This Photo by Unknown Author is licensed under CC BY-SA

4. CONTENT STANDARD: DEMONSTRATE UNDERSTANDING OF THE BASICS CONCEPTS OF TRIGONOMETRY PERFORMANCE STANDARD: Is able to apply the concepts of trigonometric ratios to formulate and solve real-life problems with precision and accuracy.

5. MOST ESSENTIAL LEARNING COMPETENTIES (MELC) : FINDS THE TRIGONOMETRIC RATIOS OF SPECIAL ANGLES CODE: M9GE-lvb-c-1

6. CONTENT/TOPIC: FINDS THE TRIGONOMETRIC RATIOS OF SPECIAL ANGLES

7. ATEOL THE STUDENTS SHOULD BE ABLE TO: a. Draw a special triangle b. Find the exact values of special triangles c. Find the measures of the angles using protractor OBJECTIVES:

8. REVIEW:

9. MOTIVATION: What have you observe on the different images in our real world? Can we apply the trigonometric ratios of angles in MAPEH subjects?

10. PROTRACTOR

11. ACTIVITY HOUSE RULES: (POSITIVE DISCIPLINE) SELECT YOUR LEADER, SCRIBE, AND REPORTER IN YOUR ACTIVITY, HAVE A TEAM WORK, RESPECT OTHERS COLLABORATE, SHARE YOUR IDEAS, ANSWERS TO YOUR GROUP MATES (TWO HEADS ARE BETTER THAN ONE) MAKE SURE THAT EVERY MEMBER HAS ITS OWN CONTRIBUTION, HELP OR ASSISTANCE IN THE ACTIVITY WORK MODERATION OF SOUND AND VOICE, BE SAFE RUBRIC IS USE TO ASSESS YOUR PERFORMANCE TASK

12. RUBRICS:

13. ACTIVITY: DIRECTIONS: PERFORM THE FOLLOWING TASK. (TIME LIMIT 15MINUTES)   Activity 1: Special Triangles & Exact Values Form two groups to do the activity below. Share your output in class. Case 1: 1. On a piece of paper, draw a square. 2. Set the length of each side to 1. 3. Cut the square along a diagonal. What triangles are formed? 4. Indicate the right angle in the triangle. 5. Determine the exact length of the hypotenuse using the Pythagorean theorem. 6. Label the hypotenuse and all other sides and angles. 7. Write the primary trigonometric ratios for 45° (SOH – CAH – TOA) 8. Rewrite the primary trigonometric ratios with rationalized denominators

14. Case 2: 1. On a piece of paper, draw an equilateral triangle. 2. Set the length of each side to 2. 3. What are the measures of the angles of the triangle? 4. Label each angle. 5. Divide the triangle into two identical triangles using an altitude. 6. The base of the triangle is now divided into equal portions of length 7. Consider only one of the new triangles. 8. Indicate the right angle in the new triangle. 9. What is the third angle in the new triangle? 10. Determine the exact height (altitude) using the Pythagorean theorem. 11. Label the altitude (and all other sides and angles) with their measures. 12. Write the primary trigonometric ratios for 30° and 60° in the triangle. 13. Rewrite the primary trigonometric ratios with rationalized denominators

15. ANALYSIS: GUIDE QUESTIONS How did you find the activity? What did you discover from the activity? What mathematical concepts did you apply to find the answer? What generalizations can you make after performing the activity?

16. ABSTRACTION:

17. APPLICATION:

18. ASSESSMENT:

19. THANK YOU VERY MUCH PREPARED BY: GLENN D. MERABE MATH TEACHER