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Question

Write the equation in standard form for the circle with radius 4 centered at the origin

Answer 1

First recall the equation for a circle: (x - h)² + (y - k)² = r²

Now all you have to do is substitute the value of the origin (0,0) for x,y and the radius(4) for r:

Standard Form: (x - 0)² + (y - 0)² = 4²