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01 Jun 2010, 05:22
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If AD is 6, and ADC is a right angle, what is the area of triangular region ABC?
(1) Angle ABD = 60°
(2) AC = 12
OPEN DISCUSSION OF THIS QUESTION IS HERE: if-ad-is-6-and-adc-is-a-right-angle-what-is-the-area-of-101200.html
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01 Jun 2010, 05:37
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Since we know the height (AD), we only need to find the base length (BC)
i: ABD = 60, but we don't know BAC or ACD, so we can only find the length of BD, not BC, which we need.
ii: Again, we can find the length of DC, but not BC.
Combined: Since we can find BD from (i), and DC from (ii), we have BC and can find the area. Answer is C.
i: ABD = 60, but we don't know BAC or ACD, so we can only find the length of BD, not BC, which we need.
ii: Again, we can find the length of DC, but not BC.
Combined: Since we can find BD from (i), and DC from (ii), we have BC and can find the area. Answer is C.
