Besides using a slider to drag the pointer, some other points of improvement of the prototype are listed below.
1) Use a simpler protractor. The size of the protractor should be as large as possible so that users can easily observe the angle.
2) Double check if some lines are straight or not.
3) Delete the line showing the abbreviations for N, S, W & E at the bottom as such information can be introduced by teachers during class.
4) Should let users know where the hotspot areas are.
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