A vertical pole PO is standing at the centre O of a square ABCD. If AC subtends an angle of `90^@` at the top , P of the pole, then the angle subtended by a side of the square at P is

A vertical pole AB is standing at the centre B of a square PQRS . If PR subtands an angle of 90^(@) at the top , A of the pole , then the angle subtended by a side of the square at A is :

Each side of a square ABCD subtends an angle of 60^(@) at the top of a tower of height h standing at the centre of a square.If a be the length of the side of the square,then

A 10 meters high tower is standing at the centre of an equilateral triangle and each side of the triangle subtends an angle of 60^(@) at the top of the tower. Then the length of each side of the triangle is.

A verrical pole subtends an angle tan^(-1)"1/2 at a points P on the ground. The angle subtended by the upper half the pole at P is

O is the centre of the circle and arc ABC subtends an angle of 130^@ at the centre. If AB is extended to P, find anglePBC

O is the centre and ABC subtends an angle of 130^@ at O. AB is extended to P. Then anglePBC is