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The radius of the circle is
.
Solución
Question 8
Find the radius of the circle.
Given the equation of the circle:
Step 1: Rewrite the equation by completing the square for both
and
.
Complete the square for
:
Complete the square for
:
Substitute back into the equation:
Simplify:
Step 2: Identify the radius.
The standard form of a circle’s equation is:
where
is the center and
is the radius.
From the simplified equation:
we can see that:
Answer: The radius of the circle is
.
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Extra Insights
The equation of the circle can be rewritten in standard form by completing the square. Here, you rearrange
and
to get
. This reveals that the center of the circle is
and its radius is
.
To graph the circle, start with the center at
and then draw a circle with a radius extending
units in all directions. For intercepts, plug
into the circle’s equation to find the x-intercepts, and
for y-intercepts, solving these will yield the points where the circle intersects the axes, if at all!

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