# Co-ordinate Geometry

By Notes Vandar

**Equation of straight line in slope intercepts form:**

Let P(x, y) be the any point line AB which makes a positive angle θ with x-axis.

From figure

∠ ACD= ∠ABE = θ

Slope of line AB = tanθ = m

PD = y- c

CD = OE =x

**Angle betweenlines y = m _{1}x+ c_{2}andy =m_{2 }x+ c_{1}**

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