Urgent, Trigonometric function and graph

A circle is divided by a chord into two segments such that the areas of the segments are in the ratio 3:1 . If the chord subtends an angle of at the centre , where is acute , show that if the angle is measured in degress and if , then

By drawing the graphs of and for values of between 30degree and 50degree, estimate the value of to the nearest half degree, that satisfies the above equation. Then obtain an approximation of the value of

I would be grateful if you can help me with the picture of the circle, thanks. I just can't envisage that.

Thanks in advance.