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

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Math Expert
Joined: 02 Sep 2009
Posts: 52433

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19 Sep 2018, 20:47
00:00

Difficulty:

15% (low)

Question Stats:

85% (00:20) correct 15% (00:19) wrong based on 33 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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20 Sep 2018, 02:55
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 = $$π(10^{-3})^2$$ = $$π10^{-6}$$

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##### General Discussion
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Joined: 01 Oct 2017
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WE: Supply Chain Management (Energy and Utilities)

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19 Sep 2018, 22:55
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, 22:55
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