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Find the area of the triangle if (i) a...

Find the area of the triangle if
(i) `a=13, b=14, c=15`
(ii) `a:b :c = 3:4:5` and s=48 cm
(iii) `a=x/y + y/z, b = y/z + z/x` and `c=z/x + x/y`

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The correct Answer is:
(i) 84 square units. , (ii) `384 cm^(2)`, (iii) `sqrt(y/z + z/x + x/y)` square units.
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