A wheel whose radius is 15 inches is turning at a speed of 300 revolutions per minute.Find the speed in miles per hour of a point on the wheel?

1 radian =

15^o 28' 32'' + 12^o 32' 58'' =

π/3 radians =

Express in radians, the measure of the internal angles of a pentagon

80^o 33' 20'' = ____________.

The angle between two hands when the time is 7.20

Give two concentric circles of radius 4 and r, find the value of r if two arcs of the same length on the two concentric circles subtend angles of 45^o and 60^o at the centre.

If the arcs of the same length in two circles subtend angles of 60^o and 75^o at the centre then the ratio of their radii is

The difference between two accute angles of a right angled triangle is π/10 radians.Then the angles of traingle are