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A circle has radius 0.001. What is its area?

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A circle has radius 0.001. What is its area?  [#permalink]

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New post 19 Sep 2018, 21:47
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A
B
C
D
E

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  15% (low)

Question Stats:

84% (00:19) correct 16% (00:19) wrong based on 30 sessions

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A circle has radius 0.001. What is its area?

(A) \(\pi \times 10^{–2}\)
(B) \(\pi \times 10^{–3}\)
(C) \(\pi \times 10^{–4}\)
(D) \(\pi \times 10^{–6}\)
(E) \(\pi \times 10^{–9}\)

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A circle has radius 0.001. What is its area?  [#permalink]

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New post 20 Sep 2018, 03:55
Bunuel wrote:
A circle has radius 0.001. What is its area?

(A) \(\pi \times 10^{–2}\)
(B) \(\pi \times 10^{–3}\)
(C) \(\pi \times 10^{–4}\)
(D) \(\pi \times 10^{–6}\)
(E) \(\pi \times 10^{–9}\)


Area of the circle = \(πr^2\)

Radius \(= 1*10^{-3}\)

Area of the circle = \(π(10^{-3})^2\) = \(π10^{-6}\)

Answer: option D
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A circle has radius 0.001. What is its area?  [#permalink]

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New post 19 Sep 2018, 23:55
Bunuel wrote:
A circle has radius 0.001. What is its area?

(A) \(\pi \times 10^{–2}\)
(B) \(\pi \times 10^{–3}\)
(C) \(\pi \times 10^{–4}\)
(D) \(\pi \times 10^{–6}\)
(E) \(\pi \times 10^{–9}\)


Given radius,r=0.001=\(10^{-3}\)
Or, \(r^2=(10^{-3})^2=10^{-6}\)

So,area of circle=\(\pi*10^{-6}\)=\(\pi\times 10^{-6}\)


Ans. (D)
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A circle has radius 0.001. What is its area? &nbs [#permalink] 19 Sep 2018, 23:55
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