Triangle is one of the basic shape of geometry .triangle is a polygon with three vertices and three sides.We can classified triangles by two ways :
1 ) By relative lengths of sides :
- the triangle in which all sides are equal is called equilateral triangle. the equilateral triangle is regular polygon with all angles measuring 60° .
- The triangle in which two sides are equal in length is called isosceles triangle. in this triangle there two two angles of the same measure which are opposite to the two sides of the same length according to the Isosceles triangle theorem.
- The triangle in which all sides are unequal is called scalene triangle . The three angles are also all different in measure.
2) By internal angles :
right triangle has one of its interior angles measuring 90° and The side opposite to the right angle is the hypotenuse and The other two sides are called the legs of the right angle. hypotenuse is the longest side in the right triangle. we can get the length of the hypotenuse by using Pythagorean theorem
a is hypotenuse and b , c are legs of the right angle
acute triangle has all interior angles are less than 90°
obtuse triangle has has one angle that measures more than 90°
a is hypotenuse and b , c are legs of the right angle
acute triangle has all interior angles are less than 90°
obtuse triangle has has one angle that measures more than 90°
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