Need Geometry help with the area and radius of a circle

Mathematics
Tutor: None Selected Time limit: 1 Day

Nov 15th, 2015

Thank you for the opportunity to help you with your question!

answer is B

The area is multiplied by 4.

Area of circle is proportional to square of radius of circle(r);

If the circle is doubled , area will be proportional to  (2r)^2=4r^2

therefore, B is right

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 15th, 2015

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