Sides of a triangle are 70 cm, 80 cm and 90 cm. Find its area. (Use 5^1/2 = 2.23)
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semi perimeter s = (70+80+90)÷2
=120cm
area of triangle = √(s(s-a)(s-b)(s-c)
=√120(120-70)(120-80)(120-90)
=√120×50×40×30
=100√12×5×4×3
=12×100√5
=1200×2.23
=2676cm^2
=120cm
area of triangle = √(s(s-a)(s-b)(s-c)
=√120(120-70)(120-80)(120-90)
=√120×50×40×30
=100√12×5×4×3
=12×100√5
=1200×2.23
=2676cm^2
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