The sum of all the angles of a triangle is 180 o.Right angled triangle – A triangle with one right angle is called a right angled triangle.Equilateral Triangle – A triangle whose all sides are equal, is calle an equilateral triangle.Scalene Triangle – A triangle, no two of whose sides are equal, is called scalene triangle.– If 2 sides of the triangle are equal, the angles opposite those sides are also equal and vice versa. RHS stands for Right angle – Hypotenuse – Side.If in two right triangles the hypotenuse and one side of one triangle are equal to the hypotenuse and one side of the other triangle, then the two triangles are congruent.– Two triangles are said to be congruent to each other if two angles and one side of one triangle are equal to two angles and one side of the other triangle. – Two triangles are congruent if two angles and the included side of one triangle are equal to the corresponding two angles and the included side of the other triangle – Axiom: Two triangles are congruent if two sides and the included angle of one triangle are equal to the corresponding sides and the included angle of the other triangle. If all sides are exactly the same, then their corresponding angles must also be exactly the same.If three sides of one triangle are equal to the three sides of another triangle, then the two triangles are congruent.The following are the criteria for the congruency of the triangles.
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