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the formula is a=1/2bh (works for any triangle) so if the height is 3, and the base is 3, than 3 (base) *3 (height) = 9, then multiply that by the 1/2 and you get 4 1/2. Hope this helps.
Above answer is incorrect because the height is not3.
The sides each = 3 and therefore the height will be somewhat less.
The height = Sqrt of (32 - 1.52) = 2.59808
The area = 1.5 x 2.59808 = 3.89711
(1.5 in above calculation = 1/2 base)
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