# 5.2.3 Circles, PT3 Focus Practice

 
                 
 Question 7:
 In diagram below, ABC is a semicircle with centre O.
 
 Calculate the area, in cm2 , of the shaded region.
                                     
 
   Solution:
                                         
 
 
 
                 
 Question 8:
 In diagram below, ABC is an arc of a circle centre O

 
     The radius of the circle is 14 cm and AD = 2 DE.
   Calculate the perimeter, in cm, of the whole diagram.
                                       
 
    Solution:
                                       
 
 
 
               
Question 9:
 
In diagram below, KLMN is a square and KLON is a quadrant of a circle with centre K.
 
 
 Calculate the area, in cm2, of the coloured region.
                     
 
 Solution: