6. ILLUSTRATIVE EXAMPLE:
• The general equation of a circle is given, Transform the
equation in standard form then, give the coordinates of the
center and the radius.
1. x2 + y2 + 2x – 2y – 16 = 0
2. 4x2+4y2-20x+12y-4=0
7. SEATWORK:
• The general equation of a circle is given, Transform the
equation in standard form then, give the coordinates of the
center and the radius.
1. x2 + y2 – 14x + 6y + 48 = 0
2. 2x2 + 2y2 + 8x + 12y – 6 = 0
8. Find the center and the radius of the circle
given its equation
Equation in general form Center Radius
a. x2 + y2 = 81
b. (x – 7)2 + (y + 7)2 = 64
c. x2 + (y+2)2= 16
d. x2 + y2 + 4x –4y = 100
e. x2 + y2-10y+25x =36