GeorgannAlicer GeorgannAlicer
  • 17-07-2014
  • Mathematics
Answered

If the radius of a circle is increased by 100%, then the area is increased by:
(A)100% (B) 200% (C) 300% (D) 400% (E) none of these



Answer :

Аноним Аноним
  • 17-07-2014
[tex]A_1=\pi r^2\\\\R=2r\ then\ A_2=\pi R^2\to A_2=\pi(2r)^2=4\pi r^2\\\\A_2-A_1=4\pi r^2-\pi r^2=3\pi r^2=3A_1\\\\3=300\%\\\\Answer:(C).[/tex]
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sugahsweetieh
sugahsweetieh sugahsweetieh
  • 23-05-2021

hope this helps in the picture below :)

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