The Definition of Triangles                                               CTriangle is plane figurewhich is bordered by th...
Triangles Based on Relative   Length of Their Sides
Equirateral TriangleEquilateral triangle is a triangle which has threeequals sides.
Isosceles triangleIsosceles triangle is a triangle which has twoequals sides.
Scalene TriangleScalene triangle is a triangle which has no equalssides.
Triangle Based on the Measure    of Their Interior Angles
Acute Triangles  Powerpoint Templates   Page 8
Obtuse TrianglesAn obtuse triangle is a triangle that hasone obtuse angle.
Right TrianglesA right-angled triangle is a triangle that has one90º angle.                Powerpoint Templates           ...
Based on its Sides and the        Measure of      Interior Angle
Right Isosceles TriangleRight isosceles triangle is a triangle that hasone 90º angle and two equal sides.               Fr...
Obtuse Isosceles TriangleObtuse Isosceles Triangle is a triangle thathas one obtuse angle and two equal sides.            ...
Acute Isosceles TriangleAcute Isosceles Triangle is a triangle thathas one acute angle and two equal sides.              F...
Obtuse Scalene TriangleObtuse Scalene Triangle is a that has oneobtuse angle and no equal sides              Free Powerpoi...
Acute Scalene TriangleAcute Scalene Triangle is a triangle that hasone acute angle and has no equal sides              Fre...
Equilateral TrianglesAll of sides are equal inlengthAll of angles are equal in     CmeasureCan fill its frame in 6 ways...
Isosceles Has two equal sides Can fill its frame in 2  ways All of its angles are acute  angle Has a pair of same angl...
Right Triangle Has a right angle Has 2 acute angles Can fill its frame in a  way We can form some  plane figures such ...
Here are...              Page 21
Angle in Triangle The sum of all angles  in triangle is 180º
Angle in Triangle                        Exterior angle is formed by                        Exterior angle is formed byThe...
Perimeter of Triangle  Sum of all the sides in triangle Example                             C 10 cm + 6 cm + 8 cm= 24 cm  ...
Area of Triangle                               A= 108 cm : 2 cm = 54 cm2   12 cm          15 cm                           ...
Thank you foryour attention.  See You
Triangle
Triangle
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Triangle

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Triangle

  1. 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. 2. Triangles Based on Relative Length of Their Sides
  3. 3. Equirateral TriangleEquilateral triangle is a triangle which has threeequals sides.
  4. 4. Isosceles triangleIsosceles triangle is a triangle which has twoequals sides.
  5. 5. Scalene TriangleScalene triangle is a triangle which has no equalssides.
  6. 6. Triangle Based on the Measure of Their Interior Angles
  7. 7. Acute Triangles Powerpoint Templates Page 8
  8. 8. Obtuse TrianglesAn obtuse triangle is a triangle that hasone obtuse angle.
  9. 9. Right TrianglesA right-angled triangle is a triangle that has one90º angle. Powerpoint Templates Page 10
  10. 10. Based on its Sides and the Measure of Interior Angle
  11. 11. Right Isosceles TriangleRight isosceles triangle is a triangle that hasone 90º angle and two equal sides. Free Powerpoint Templates Page 12
  12. 12. Obtuse Isosceles TriangleObtuse Isosceles Triangle is a triangle thathas one obtuse angle and two equal sides. Free Powerpoint Templates Page 13
  13. 13. Acute Isosceles TriangleAcute Isosceles Triangle is a triangle thathas one acute angle and two equal sides. Free Powerpoint Templates Page 14
  14. 14. Obtuse Scalene TriangleObtuse Scalene Triangle is a that has oneobtuse angle and no equal sides Free Powerpoint Templates Page 15
  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. 16. Equilateral TrianglesAll of sides are equal inlengthAll of angles are equal in CmeasureCan fill its frame in 6 waysThe sum of all angles is B180ºHas three axes of symmetry 180º
  17. 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. 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. 19. Here are... Page 21
  20. 20. Angle in Triangle The sum of all angles in triangle is 180º
  21. 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. 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. 23. Area of Triangle A= 108 cm : 2 cm = 54 cm2 12 cm 15 cm B C 9 cm
  24. 24. Thank you foryour attention. See You

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