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**[SOLVED] the magnitude of torque**

## Homework Statement

Determine the magnitude of the torque about A by evaluating lABxFl (the magnitude of vector AB cross vector F) where AB = -15i + 12j and F= -200lbs (cos theta)i - 200lbs (sin theta)j

## Homework Equations

cross product and maybe the magnitude of torque

## The Attempt at a Solution

so i did the cross product and ended up with

k = (-15(-200 sin theta))-(12(-200cos theta)) whick i simplified

to 3000(sin theta) + 2400(cos theta)

so k = 3000(sin theta) + 2400(cos theta)

so am I done or should I take the sqrt of the values = to k ??

the problem i have with this is theta is undefined and i would end up with a more complicated expression.

so what do i do