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Applying the Equation of a Circle Practice Test
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Q1
The above figure shows a circle on the coordinate axes with its center at the origin. 
has length 
.
Give the equation of the circle.
The above figure shows a circle on the coordinate axes with its center at the origin.
Give the equation of the circle.
. Circle A is shifted up five units and left by six units. Then, its radius is doubled. What is the new equation for circle A?