The angle between the lines 2x-y+ 3 = 20 and x + 2y+3=0 is
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Rearrange both equation in the form of y=mx+c;
y=2x+3; Slope m1=2
y=(-1/2)x-(3/2); Slope m2=-1/2
Angle is ∅=tan^(-1)(m1-m2)/(1-m1.m2)
=tan^(-1)(2.5)/(0)
Angle is ∅=90 degree
y=2x+3; Slope m1=2
y=(-1/2)x-(3/2); Slope m2=-1/2
Angle is ∅=tan^(-1)(m1-m2)/(1-m1.m2)
=tan^(-1)(2.5)/(0)
Angle is ∅=90 degree
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