A circle has the equation x2+ y2 = 9. What is the length of the radius?
2 answers:
Answer:
<h2><u>
3</u></h2>
Step-by-step explanation:
The standard form of the equation of a circle is
(
x
−
a
)
^2
+
(
y
−
b
)
2
=
r
^2
where (a,b) are the coords of the centre and r , the radius.
x
^2
+
y
^2
=
9
is in this form with a = b = 0 and r = 3
Answer:
The center is (0,0) and the radius is 3
Step-by-step explanation:
The equation of a circle is given by
(x-h)^2+(y-k)^2 = r^2
Where (h,k) is the center and r is the radius
(x-0)^2+(y-0)^2 = 3^2
The center is (0,0) and the radius is 3
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