Question

find out the area of triangle if three sides are 3cm 4cm and 5cm​

Answer 1

Answer:As we can clearly observe that the sides of the given triangle are Pythagorean triplets.

so, the length of lac base is 4 cm, and the height is 3 cm.

From the basic formula for the area of a triangle,

1/2 × base × height

= 1/2×3×4

= 3×2

= 6 cm^2

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Answer 2

Answer below:

$6cm^{2}$

Explanation:

Area of a scalene triangle = $\sqrt{s(s-a)(s-b)(s-c)}$

where s is the semi-perimeter of the triangle.

Given,

1st side = 3cm, 2nd side =  4cm and 3rd side = 5 cm

∴ Semi-perimeter of the triangle = {(3+4+5)/2} cm

                                                          = 6 cm

So, area = $\sqrt{s(s-a)(s-b)(s-c)}$

              = $\sqrt{6(6-3)(6-4)(6-5)}$ $cm^{2}$

              = $\sqrt{6*3*2*1}$ $cm^{2}$

              = $\sqrt{36}$ $cm^{2}$

              = $6 cm^{2}$

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