Triangle

Types of triangle
Three straight line intersect to each other there are make triangle. Triangle is a closed set, there are three angle and three side.
Types of triangle according to side
-Isosceles triangle
-Equilateral triangle
-Sealant triangle
Types of triangle according to angle
-Acute angle triangle
-Right angle triangle
Obtuse angle triangle
Some theorem of triangle
*Some of angle of triangle is 180 degree.
*Base angles of an isosceles triangle are equal.
*Each of the base angles of an isosceles right triangle is 45 degree.
*An exterior angle of a triangle is greater than either remote interior angle.
*If two sides of a triangle are unequal, the angles opposite them are unequal and the larger angle is opposite the longer side.
*The sum of the lengths of any two sides of a triangle is greater than the length of the third side.
*In a correspondence of right triangles, if the hypotenuse one corresponds and is congruent to that of the other and if one pair of corresponding acute angles are congruent angles, then the correspondence is a congruence.
*In a correspondence of right triangles, if the hypotenuse of one corresponds and is congruent to that of the other and if one of the other airs of corresponding sides are congruent sides, then the correspondence is a congruence.

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