# Sides of the triangle

Calculate triangle sides where its area is S = 84 cm2 and a = x, b = x + 1, xc = x + 2

Result

a =  13 cm
b =  14 cm
c =  15 cm

#### Solution:

$S = \sqrt{s(s-a)(s-b)(s-c)} = 84 \ \\ s = (a+b+c)/2 = (3x+3)/2 = 1.5x +1.5 \ \\ (1.5x +1.5)(1.5x +1.5-x)(1.5x +1.5-x-1)(1.5x +1.5-x-2) = 84^2 \ \\ (1.5x +1.5)(0.5x+1.5)(0.5x+0.5)(0.5x-0.5)= 7056 \ \\ \ \\ 0.1875 x^4+0.75 x^3+0.375 x^2-0.75 x-7056.56 = 0 \ \\ \ \\ x = 13 \ \\ a = x = 13 \ \text{cm} \ \\$
$b=13+1=14 \ \text{cm}$
$c=13+2=15 \ \text{cm}$

Equation is non-linear.
Equation is not cubic.

## The real roots of the equation:

x1 = -14.999998772705
x2 = 12.999998772705

Calculated by our simple equation calculator.

Try calculation via our triangle calculator.

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