C L r Where C is the central angle in radians L is the arc length. C is the circumference of the circle p is Pi approximately 3142 If you know the area If you know the area of a circle the radius can be found using the formula where. To calculate the radius.
Now using the formula for chord length as given.
Another way of measuring angles instead of degrees are Radians. You know that th 120 since it is given that angle KPL equals 120 degrees. Since we know rd2. Then once we have the rectangles length we can find its width because we know the rectangles perimeter.