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Unformatted text preview: at we could have this is to
have both h and k be zero. So, the center and radius is, center = ( 0, 0 ) radius = 1 = 1 Don’t forget that the radius is the square root of the number on the other side of the equal sign.
Here is a sketch of this circle. © 2007 Paul Dawkins 170 http://tutorial.math.lamar.edu/terms.aspx College Algebra A circle centered at the origin with radius 1 (i.e. this circle) is called the unit circle. The unit
circle is very useful in a Trigonometry class.
[Return to Problems] (b) x 2 + ( y  3) = 4
2 In this part, it looks like the x coordinate of the center is zero as with the previous part. However,
this time there is something more with the y term and so comparing this term to the standard form
of the circle we can see that the y coordinate of the center must be 3. The center and radius of
this circle is then, center = ( 0,3) radius = 4 = 2 Here is a sketch of the circle. The center is marked with a red cross in this graph. [Return to Problems] (c) ( x  1) + ( y + 4 ) = 16
2 2 For this part neither of the coordinates of...
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 Spring '12
 MrVinh

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