**length of the arc of a sector is 66 cm and the sector angle is 45 degree. Find its radius.**

Length of the arc = 66

Sector angle = 45

Radius of the Arc (r) =

Radius of the Arc (r) = (360/45) * (1/(2 * (22/7))) * 66

Radius = 84

The plane figure enclosed by two radii of a circle or ellipse and the arc between them.

where,