exam Maths Puzzle Numerical Ability

I keep coming up with a solution that is different from the answer key. Here is the problem: Find the area of an isosceles triangle where the base is 3 and the sides are the square root of 11.
Thanks

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exam Other Question
G(F(x)) g(x)=x/x+2 F(x)=2/x

2/x
______ solve.... and find the domain.
2/x +2 twice the greater of two consecutive odd integers is 13 less than three times the lesser. find the number

define a variable
write equation
solve

can you show me how to do this problem please?