# Resultant force

Calculate mathematically and graphically the resultant of a three forces with a common centre if:

F1 = 50 kN α1 = 30°
F2 = 40 kN α2 = 45°
F3 = 40 kN α3 = 25°

Correct result:

F =  113.1225 kN
f =  65.613 °

#### Solution:

$f=\frac{18{0}^{\circ }}{\pi }\cdot \mathrm{arctan}\left(y\mathrm{/}x\right)=\frac{18{0}^{\circ }}{\pi }\cdot \mathrm{arctan}\left(103.0293\mathrm{/}46.7081\right)=65.61{3}^{\circ }=6{5}^{\circ }3{6}^{\mathrm{\prime }}47\mathrm{"}$

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Tips to related online calculators
For Basic calculations in analytic geometry is helpful line slope calculator. From coordinates of two points in the plane it calculate slope, normal and parametric line equation(s), slope, directional angle, direction vector, the length of segment, intersections the coordinate axes etc.
Two vectors given by its magnitudes and by included angle can be added by our vector sum calculator.
Pythagorean theorem is the base for the right triangle calculator.

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