Answers to Chapter 7 Review Questions
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9.  The eight functions are InitGraphics, MovePen, DrawLine, DrawArc,
    GetWindowWidth, GetWindowHeight, GetCurrentX, and GetCurrentY
    (summarized on page 227 of the textbook)

10. InitGraphics();

11. MovePen

12. MovePen(0, 0);
    DrawLine(2, 1);

13. If the third argument to DrawArc is negative, the arc is drawn clockwise
    from its starting point instead of counterclockwise.

14. (a) counterclockwise starting at 3 o'clock and ending at 6 o'clock
    (b) clockwise starting about 11 o'clock and ending about 1 o'clock
    (c) clockwise starting at 9 o'clock and ending about 10 o'clock
    (d) counterclockwise starting at 6 o'clock and ending at 12 o'clock

16. call GetWindowWidth and GetWindowHeight and divide each of the returned
    values by 2