How much is the angle between the two slanted lines in this figure?
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Slope of any straight line on the X-Y plane is given by tan θ , where θ is the angle which the straight line makes with the positive direction of x axis.
So , m = tan θ ( where m is the slope of that straight line which is inclined at an angle θ with the positive direction of x axis)
So, θ = tan^(-1)m
EXAMPLE , there is a straight line having a slope 1.
So, tan θ = 1
very clearly , θ = 45 degrees.
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what is the lines in this figure
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