NDA | Mathematics | Properties of Triangle

The sides of the triangle are in the ratio  , then the angles of the triangles are in the ratio

In a , if a = 13, b = 14 and c = 15 then find the value of tan (B/2)?

If the angle of a triangle are  and the included side is  then the area of the triangle is

In any triangle ABC if , then the triangle is

The angles of a triangle ABC are in A.P, and it is being given that