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# If A is the point (-4, 1) and B is the point (2, 1), what is the area

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Math Expert
Joined: 02 Sep 2009
Posts: 55802
If A is the point (-4, 1) and B is the point (2, 1), what is the area  [#permalink]

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25 Nov 2018, 23:58
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89% (00:54) correct 11% (01:14) wrong based on 54 sessions

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If A is the point (-4, 1) and B is the point (2, 1), what is the area of the circle that has AB as a diameter?

A. 3π
B. 6π
C. 9π
D. 12π
E. 36π

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Re: If A is the point (-4, 1) and B is the point (2, 1), what is the area  [#permalink]

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26 Nov 2018, 00:11
AB = sq.rt{(2-(-4))^2 +(1-1)^2} = 6 (diameter)
Area = pi*3*3 = 9*pi. (option C).
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Joined: 18 Oct 2018
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If A is the point (-4, 1) and B is the point (2, 1), what is the area  [#permalink]

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06 Dec 2018, 03:40
Bunuel wrote:
If A is the point (-4, 1) and B is the point (2, 1), what is the area of the circle that has AB as a diameter?

A. 3π
B. 6π
C. 9π
D. 12π
E. 36π

Value for y is the same (1), therefore we can look at the difference between the x values of A and B (-4+2=6).
This means, 6 is the difference between both points and the diameter of the circle (radius = 3).
Area of circle= $$3^2\pi=9\pi$$

Anwer: C
If A is the point (-4, 1) and B is the point (2, 1), what is the area   [#permalink] 06 Dec 2018, 03:40
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