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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