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28 Feb 2016, 17:54
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (00:50) correct
12%
(01:34)
wrong
based on 194
sessions
History
Date
Time
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Not Attempted Yet
What is the area of an equilateral triangle whose one side length is 60?
A. 300√3
B. 400√3
C. 450√3
D. 600√3
E. 900√3
* A solution will be posted in two days.
A. 300√3
B. 400√3
C. 450√3
D. 600√3
E. 900√3
* A solution will be posted in two days.
28 Feb 2016, 20:41
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MathRevolution
By using the formula you can arrive i.e
(\sqrt{3}/4) * A2 or
If you don't rember the formula then, Bisecting an equvi triangle from any vertices will yield two triangles in the form of 30:60:90
The ratio of sides of the triangle is 1:2:\sqrt{3}
If you don't know the ratio of sides, apply pythagorus to find the height.
Once you find the height = B * H will give the area of equvi triangle.
IMO E
28 Feb 2016, 22:18
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MathRevolution
Area of an equilateral triangle = (s²/4)√3, where s = length of one side.
So...
Area = (60²/4)√3
= (3600/4)√3
= 900√3
= E
Cheers,
Brent
