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## Homework Statement

Three point particles are fixed in place in the xy plane. The three partiles sit on the

corners of an equilateral triangle with sides of length a = 2.50 mm. Particle 1 has a mass m1 = 12.0 kg,

particle 2 has a mass m2 = 18.0 kg, and particle 3 has a mass m3 = 15.0 kg.

1. What is the magnitude and direction of the net gravitational force exerted on particle 1 by the other

two particles?[/B]

## Homework Equations

G((m

_{1}m

_{2})/a

^{2})

and

G((m

_{1}m

_{3})/a

^{2})

## The Attempt at a Solution

I'm trying to use the above equation and separate them by its x and y components. But I feel that because its an equilateral triangle I need to somehow make it into a right triangles so that the radius from mass 1 of both particles will be 30 degrees from mass 1 if I make mass 1 the origin.

How do I attack this problem?