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Home  >>  JEEMAIN and NEET  >>  Mathematics  >>  Trignometry

Find the area of the $\Delta$ if $a=18,b=24,c=30$

$(a)\;216sq.units\qquad(b)\;215sq.units\qquad(c)\;214sq.units\qquad(d)\;210sq.units$

1 Answer

We know that
$\Delta=\sqrt{s(s-a)(s-b)(s-c)}$
$\quad=\sqrt{36(36-18)(36-24)(36-30)}$
$\quad=\sqrt{36\times 18\times 12\times 6}$
$\quad=\sqrt{2\times 18\times 18\times 6\times 2\times 6}$
$\quad=\sqrt{46656}$
$\quad=216$sq.units
Hence (a) is the correct answer.
answered Oct 10, 2013 by sreemathi.v
 

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