C2-Radian measure & its application?

Please help me to solve following problems:





1. Referring to the diagram,


Link: http://farm3.static.flickr.com/2210/2134...





find:


a) The perimeter of the shaded region when θ = 0.8 radians.


b) The value of θ when the perimeter of the shaded region is 14 cm.


-----------------


2. In the diagram AB is the diameter of a circle, centre O and radius 2 cm. The point C is on the circumference such that angle COB = 2/3 π radians.





For diagram, link: http://farm3.static.flickr.com/2286/2134...





The shaded region enclosed by the chord AC, arc CB %26amp; AB is the template for a brooch.


Find the exact value of the perimeter of the brooch.

C2-Radian measure %26amp; its application?
2. In the diagram AB is the diameter of a circle, centre O and radius 2 cm. The point C is on the circumference such that angle COB = 2/3 π radians.





Perimeter = chord AC + arcBC + AB





Angle AOC = 1/3 π and is an equilateral triangle


chord AC = 2





arc BC = rΘ


arc BC = 2 ( 2/3 π) = 4π/3





AB = 4





Perimeter = 2 + 4π/3 + 4


Perimeter = 6 + 4π/3
Reply:Something's wrong with the diagrams. There are no shaded areas.

anemone