Question

The sides of triangle are 3cm,4cm,5cm.its area is

Answer 1

∆= √s(s - a)(s - b)(s - c)

where s = (a+b+c) / 2

here a=3,b=4,c=5. (in cm)

then,

s = (3+4+5) / 2

s = 6

∆ = √6(6-3)(6-4)+(6-5)

∆= √ 6×3×2×1

∆= √ 36

∆ = 6

Hope it helps.....

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