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x² + y² = 16
b) r² = (2-0)²+(6-0)²
= 4+36
= 40
(x-0)²+(y-0)² = 40
x² + y² = 40
c) r = 1/2 d
= 7/2
(x-2)²+ (y-1)² = (7/2)²
x²-4x+4+y²-2y+1 = 49/4
4x²-16x+16+4y²-8y+4 = 49
4x²+4y²-16x-8y-29 = 0
d) r² = (0+4)²+(3+3)²
= 16 + 36
= 52
(x+4)² + (y+3)² = 52
x²+8x+16+y²+6y+9-52 = 0
x²+y²+8x+6y-27 = 0
e) r = IxI
= 5
r² = 25
(x+5)²+(y-3)² = 25
x²+10x+25+y²-6y+9 = 25
x²+y²+10x-6y+9 = 0
f) r = I2-(-2)I
= 4
r² = 16
(x-4)²+(y+2)² = 16
x²-8x+16+y²+4y+4 = 16
x²+y²-8x+4y+4 = 0