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- 1. The Definition of Triangles CTriangle is plane figurewhich is bordered by threelines (sides) A B Vertex Vertex :: A, B, C A, B, C Side Side :: AB, AC, BD AB, AC, BD
- 2. Triangles Based on Relative Length of Their Sides
- 3. Equirateral TriangleEquilateral triangle is a triangle which has threeequals sides.
- 4. Isosceles triangleIsosceles triangle is a triangle which has twoequals sides.
- 5. Scalene TriangleScalene triangle is a triangle which has no equalssides.
- 6. Triangle Based on the Measure of Their Interior Angles
- 7. Acute Triangles Powerpoint Templates Page 8
- 8. Obtuse TrianglesAn obtuse triangle is a triangle that hasone obtuse angle.
- 9. Right TrianglesA right-angled triangle is a triangle that has one90º angle. Powerpoint Templates Page 10
- 10. Based on its Sides and the Measure of Interior Angle
- 11. Right Isosceles TriangleRight isosceles triangle is a triangle that hasone 90º angle and two equal sides. Free Powerpoint Templates Page 12
- 12. Obtuse Isosceles TriangleObtuse Isosceles Triangle is a triangle thathas one obtuse angle and two equal sides. Free Powerpoint Templates Page 13
- 13. Acute Isosceles TriangleAcute Isosceles Triangle is a triangle thathas one acute angle and two equal sides. Free Powerpoint Templates Page 14
- 14. Obtuse Scalene TriangleObtuse Scalene Triangle is a that has oneobtuse angle and no equal sides Free Powerpoint Templates Page 15
- 15. Acute Scalene TriangleAcute Scalene Triangle is a triangle that hasone acute angle and has no equal sides Free Powerpoint Templates Page 16
- 16. Equilateral TrianglesAll of sides are equal inlengthAll of angles are equal in CmeasureCan fill its frame in 6 waysThe sum of all angles is B180ºHas three axes of symmetry 180º
- 17. Isosceles Has two equal sides Can fill its frame in 2 ways All of its angles are acute angle Has a pair of same angle Has an axis of symmetry
- 18. Right Triangle Has a right angle Has 2 acute angles Can fill its frame in a way We can form some plane figures such as... Page 20
- 19. Here are... Page 21
- 20. Angle in Triangle The sum of all angles in triangle is 180º
- 21. Angle in Triangle Exterior angle is formed by Exterior angle is formed byThe measure of an one side and the extension one side and the extensionexterior angle of a of another side of angle of another side of angletriangle is equal tothe sum of twointerior angles which Exterior Angleare notsupplementary to theexterior angle. Interior Angle Page 23
- 22. Perimeter of Triangle Sum of all the sides in triangle Example C 10 cm + 6 cm + 8 cm= 24 cm 8 cm 10 cm A B 6 cm Free Powerpoint Templates Page 24
- 23. Area of Triangle A= 108 cm : 2 cm = 54 cm2 12 cm 15 cm B C 9 cm
- 24. Thank you foryour attention. See You

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