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Multiple Choice
Give the center and radius of each circle and graph.
A
; Center:
B
r=6; Center: (0,0)
C
r=6; Center: (6,0)
D
r=6; Center: (0,0)
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Verified step by step guidance
1
Identify the general form of the equation of a circle: \(\left(x - h\right)^2 + \left(y - k\right)^2 = r^2\), where \((h, k)\) is the center and \(r\) is the radius.
Look at the given equation \(x^2 + y^2 = 36\). Notice that it matches the general form with \(h = 0\) and \(k = 0\), so the center is at the origin \((0,0)\).
Determine the radius by taking the square root of the constant on the right side of the equation: \(r = \sqrt{36}\).
From the graph, confirm that the circle is centered at \((0,0)\) and passes through points such as \((6,0)\), \((0,6)\), \((-6,0)\), and \((0,-6)\), which verifies the radius is 6.
To graph the circle, plot the center at \((0,0)\) and mark points 6 units away in all directions (up, down, left, right), then draw a smooth curve connecting these points to form the circle.