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Lesson Plan
I. Objectives At the end of the lesson, the students should be able to: 1. illustrate the angles formed by parallel lines cut by a transversal; 2. name the angles formed by parallel lines cut by a transversal; and 3. describe the angles formed by parallel lines cut by a transversal. II. Subject Matter Topic: Angles Formed by Parallel Lines Cut by a Transversal Reference: Geometry III Textbook for 3rd year By: Cecile M. de Leon Soledad Jose-Dilao, Ed. D. Julita G. Bernabe pp. 82 – 86 Materials: Visual Aids Pentel Pen Answer Sheets Ruler Teaching Strategies: Analysis Cooperative Learning Values Integration: Cooperation Skills to be developed: Verbal Ability Critical Thinking III. Procedure A. Introductory Activities 1. Daily Routine 1.1 Prayer 1.2 Greetings 1.3 Checking of Attendance 2. Review 2.1 What are parallel lines? 3. Motivation Television Antennae B. Lesson Proper 1. Development of the lesson Study this figure
1 2 3 4 56 7 8
a. Angles 1, 2, 7, and 8 are exterior angles. b. Angles 3, 4, 5, and 6 are interior angles. c. Angles 1 and 5 are corresponding angles. Based on the figure, can you give other angles which can be called corresponding angles? d. Angles 3 and 6 are alternate-interior angles. Name another alternateinterior angles. e. Angles 1 and 8 are alternate-exterior angles. Name another alternateexterior angles. 2. Activity Divide the students into four (4) groups. Group 1 Illustrate a figure, show m l l n with o as transversal. Name: a. 4 pairs of corresponding angles b. 2 pairs of alternate-interior angles Group 2 Illustrate a figure, show a l l b with c as transversal. Name: a. 4 pairs of corresponding angles b. 2 pairs of alternate-interior angles Group 3 Illustrate a figure, show m l l n with o as transversal. Name: a. 2 pairs of alternate-exterior angles b. 2 pairs of interior angles on the same side of the transversal c. 2 pairs of exterior angles on the same side of the transversal Group 4 Illustrate a figure, show a l l b with c as transversal. Name: a. 2 pairs of alternate-exterior angles b. 2 pairs of interior angles on the same side of the transversal c. 2 pairs of exterior angles on the same side of the transversal Guide Questions: For group 1 and 2 1. What is the position of the corresponding angles with respect to a
transversal? Describe their vertices. 2. What is the position of alternate-interior angles with respect to a transversal? For group 3 and 4 1. What is the position of alternate-exterior angles with respect to a transversal? 2. What is the position of interior angles on the same side of the transversal? exterior angles on the same side of the transversal? Discussion of the Activity A member of each group will discuss the result of their activity.
C. Summary of the Lesson Corresponding angles consist of two non-adjacent angles on the same side of a transversal, one in the interior and the other in the exterior. Alternate-interior angles consist two non-adjacent interior angles on the opposite side of a transversal. They have same measure. Alternate-exterior angles consist two non-adjacent exterior angles on the opposite side of a transversal. They have same measure. •
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D. Fixing Skills j Given: b l l c cut by a transversal j What is a. /_ 1 and /_ 5? b. /_ 2 and /_ 7? c. /_ 3 and /_ 6? d. /_ 4 and /_ 6? e. /_ 2 and /_ 8?
b
1 2 3 4
c
56 78
IV. Assessment Given: a l l b; c l l d 1. Name two angles corresponding to /_ 4? 2. What two angles can be paired with /_ 6 to make them alternate-interior angles? 3. Which angles are alternate-exterior angles with /_10? V. Assignment What other relations exist between angles 5 and 6? angles 1 and 3? Name other pairs of angles. Is any angle a right angle? Why?
