Hello, geton!
Are you familiar with the formula for the area of a sector? .
The area of sector
The area of sector
Their difference is: .
. . . . . Solve for
Please help me to solve this.
In the diagram, http://farm3.static.flickr.com/2255/...474b2ea3_m.jpg
AD and BC are arcs of circles with centre O, such that OA = OD = r cm, AB = DC = 8 cm and angle BOC = θ radians.
Given that the area of the shaded region is 48 cm^2, show that r = 6/θ – 4.