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If the radius of the circle is tripled, which of the following points will NOT be inside the circle?

If the radius of the circle is tripled, which of the following points will NOT be-example-1
User Dbenham
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1 Answer

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The equatio of a circle with radius 3 would be: x^2 + y^2=9. If the radius is 9, then the equation would be:

x^2+ y^2 = 81. If a point is inside the circle then x^2+ y^2 <= 81

A. (-9)^2+ (3)^2 <= 81 (Replacing point A)

A. 81 +9 <= 81 (Raising both numbers to the power of 2)

A. 90 <=81 (As 90 is greater than 81, this point is not inside the circle)

The answer is the option A.

User Learntheropes
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