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# In the figure attached, the radius of the circle with center

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In the figure attached, the radius of the circle with center [#permalink]

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10 Feb 2007, 11:00
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In the figure attached, the radius of the circle with center O is 1 and BC=1. What is the area of triangular region ABC?

A) sqrt2/2
B) sqrt3/2
C) 1
D) sqrt2
E) sqrt3
Attachments

Figure 1.doc [26 KiB]

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10 Feb 2007, 13:24
From the figure, Angle(ABC) = 90 degrees {Any triangle in the semicircle with its base = diameter is a right triangle)

AB^2 = 2^2 - 1^2 = 4-1
AB = sqrt(3)

Area = 1/2 x base x height
= 1/2 x sqrt(3) x 1
= sqrt(3)/2

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