How do you prove two circles are similar

In the diagram below, tan θ = sqrt 3. what is the value of m?

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12