Question

Students of a school organised a rally for “Beti Bachao, Beti Padhao” . They prepared a triangular signboard for rally of sides 90cm, 70cm and 40cm. Find the area of signboard. Also find the perimeter of this signboard.

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

Area = 1341.64 cm^2

Perimeter = 200 cm

Step-by-step explanation:

First find semi-perimeter (s) : (90+70+40)/2 = 100 cm^2

Apply Heron's formula : $\sqrt{s(s-a)(s-b)(s-c)}$

= $\sqrt{100(100-90)(100-70)(100-40)}$

= 1341.64 cm^2

= Area

Perimeter = s*2

= 200 cm