The perimeter of `/_\ABC` is 6 times the arithmetic mean of the sines of its angles. If a = 1, find the angle A

The arithmetic mean of 1,2,3…n is

Find the arithmetic mean of the following: 3 and 12.

Find the arithmetic mean of the following: 7 and 29.

Find the arithmetic mean of the following: -6 and -30 .

Find the arithmetic mean of the following: (x-a)^2 and (x+a)^2 .

The perimeter of a rectangle is 200 cm. If its length is three times of its breadth, find the length and breadth of the rectangle.

ABC is a right angle triangle right angled at C. If sin A = 3/5 find tanB.

The angles of a triangle are in A.P. and the ratio of number of degree in the least angle to the number of radian in the greatest angle is 60 :pi . Find the angles in degree.

If the area of the sector is 5/8 times, the area of the circle, find the central angle formed by the sector.

ABC is a right angle triangle right angled at C. If angle A= 60° and AC= 6cm . Find CB and AB.