Triangle A
triangle is a plane and closed figure bounded by three line segments. A vertex of a triangle is a point where any two of its sides meet. Every triangle has three angles
Types of the triangles According
to the sides:-Isosceles triangle,equilateral triangle,scalene triangle. According to the angles:-acute angled triangle, right angled triangle, obtuse angled triangle
Some important results An exterior angle of a triangle is an adjacent and supplementary angle to the corresponding interior angle of the triangle. An exterior angle of a triangle is always equal to the sum of its two interior opposite angles. On producing the sides of a triangle , six exterior angles are formed, two at each vertex. Sarbjeet 9th-b