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# Triangle

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# Triangle

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### Triangle

1. 1. Mohammed Naveed VI-c
2. 2.  a plane figure with three straight sides and three angles.
3. 3.  There are three special names given to triangles that tell how many sides (or angles) are equal.  Equilateral  Isosceles  Scalene
4. 4.  In geometry, an equilateral triangle is a triangle in which all three sides are equal. In traditional or Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°.
5. 5.  In geometry, an isosceles triangle is a triangle that has two sides of equal length. Sometimes it is specified as having two and only two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.
6. 6.  A scalene triangle is a triangle that has three unequal sides, such as those illustrated above.
7. 7. What is an angle ?  the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.  "in any triangle, the longest side is opposite the largest angle"
8. 8.  Right Angled Triangle :  Obtuse Angled Triangle  Acute Angled Triangle
9. 9.  Right angle triangle is a triangle with one of its angle exactly equal to 90°.As shown in the picture.
10. 10.  Obtuse angle triangle is a triangle with one of its angle greater than (>) 90°. As shown in the picture
11. 11.  Acute angle triangle is a triangle with all three angle less than (<) 90°. As shown in the picture