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The third side must be 18 m. (It cannot be 2.25 m because then the two equal sides would sum to 4.5 m which is less than the third.) Denote the 3 sides by a, b and c and let

s = (a+b+c)/2 = 19.125 m

Then area = sqrt[s*(s-a)*(s-b)*(s-c)]

= 20.21 m2 approx.

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Q: What is the area of an isosceles triangle if one side is 18m and the other 2.25m?
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