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- 2. Table of Contents <ul><li>Objective </li></ul><ul><li>Review </li></ul><ul><li>Definition of a Triangle </li></ul><ul><li>Samples of Triangular Objects </li></ul><ul><li>Types of angles </li></ul><ul><li>Congruence of Line Segments </li></ul><ul><li>According to Angle Measure </li></ul><ul><li>According to Length of sides </li></ul><ul><li>Review Questions </li></ul>
- 3. Objective: <ul><li>At the end of the lesson, the students should be able to classify triangles. </li></ul>
- 4. REVIEW
- 5. Triangle <ul><li>It is a three sided polygon. </li></ul>A B C AC AB BC
- 6. Samples of Triangles that can be seen around us.
- 7. TYPES OF ANGLES
- 8. <ul><li>Acute Angle </li></ul>-It is an angle whose measure is less than 90 0 . 30 0 A B C <BAC which is an acute angle.
- 9. Right Angle <ul><li>-It is an angle whose measure is equal to 90 0 . </li></ul>90 0
- 10. Obtuse Angle <ul><li>- It is an angle whose measure is greater than 90 0 but less than 180 0 . </li></ul>150 0
- 11. How can we say that two segments are Congruent ?
- 12. <ul><li>*Two segments are congruent if and only if they have equal length. </li></ul>C D 10 cm 10 cm measure of AB = measure of CD A B
- 13. CLASSIFICATION OF TRIANGLES <ul><li>According to angles </li></ul><ul><li>According to sides </li></ul>
- 15. *ACUTE TRIANGLE <ul><li>-All the angles of the triangle are acute. </li></ul>60 0 48 O J L K 72 0 <J,<K,<L are all acute angles.
- 16. RIGHT TRIANGLE <ul><li>-An angle in a triangle is a right angle. </li></ul>90 0 M O N <M is a right angle. leg leg The side opposite the right angle of a right triangle is called the hypotenuse . The other sides are called legs. HYPOTENUSE
- 17. OBTUSE TRIANGLE <ul><li>- An angle in a triangle is an obtuse angle. </li></ul>P Q 128 0 <P is an obtuse angle. R
- 18. Triangles According to there sides
- 19. SCALENE TRIANGLE <ul><li>- No two sides are congruent. </li></ul>A B A B = BC = CA 4 cm 6 cm C 9 cm ~ ~
- 20. ISOSCELES TRIANGLE <ul><li>- two sides of the are congruent. </li></ul>D F E DE = FE base leg leg The two equal sides of an isosceles triangle are called legs . The third side is called the base . ~
- 21. EQUILATERAL TRIANGLE <ul><li>- Three sides are congruent. </li></ul>G I H GH = HI = GI ~ ~
- 22. Reported to: Salvador Salazar Reported by: Jeremy Javier Mr. THE END!!!

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