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10 cards from this deck
Points where line crosses x-axis and y-axis
Zero
Set y=0y = 0y=0 and solve for xxx
Set x=0x = 0x=0 and solve for yyy
The constant term ccc
Angle line makes with positive x-axis direction
tanθ=m\tan \theta = mtanθ=m where mmm is gradient
θ=arctan(m)\theta = \arctan(m)θ=arctan(m), gives acute angle
θ=180°−arctan(∣m∣)\theta = 180° - \arctan(|m|)θ=180°−arctan(∣m∣), gives obtuse angle
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