Question

Find the equation of circle whose center is at origin and radius 4 units.

Answer 1

Answer:

The equation of a circle with center and radius units is ( x − h )^ 2 + ( y − k )^ 2 = r^ 2 .

Step-by-step explanation:

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Answer 2

Answer:

The equation of a circle with centre(h,k) and radius a is given by

${(x - h)}^{2} + ( {y - k}^{2} ) = {a}^{2}$

Thus,

x^2 + y^2 =16