Page 3 - PowerPoint Presentation

EXAMPLE 1:

Find the equation of a circle having its centre at (-5,-9) and

radius of length 2 units.
3

Solution :

method 1
3
Substituting -5 for h, -9 for k, and 2 for r into
 
2
standard equation:  x h  y k  2  r 2



2
2

 y
2
x
we obtain   ( ) 5    ( ) 9    3 2
( x ) 5 2  ( y ) 9 2  ) 3 ( 4  12

after expanding the equation we obtain the equation

x  y  10x  18y  94 0
2
2