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The equation of a circle is x2 + y2 = 42.25
find the radius of the circle

User Yermy
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3 votes

Answer:

The equation of a circle centred at the origin is

  • x² + y² = r² ( where r is the radius )

  • x² + y² = 42.25 ← is in this form

with r² = 42.25 ( take the square root of both sides )


\rm\sf{r = 42.25} =
\sf\red{6.5}

User Travnik
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