The title is pretty much the question, but for more elaboration..:

Define the functions...f(x) = sinx where x is measured in radiansg(x) = sinx where x is measured in degrees.On the same set of axes, draw the graphs of both f(x) and g(x) for 0≤x≤20. Indicate on your graph the smallest positive solution to the equation f(x) = g(x) and estimate the numerical value of this x.

Subtext:Of course this is an amusing value of x. It has the property that if you ask me for its sine, I don’t have to ask you whether to put my calculator in radian or degree mode. The answer’s the same!This reminds me of the Centigrade and Fahrenheit temperature scales. If you tell me “it’s 40 below” I don’t have to ask you whether you mean C or F.

I don't understand how to find x using a graph.