Exercise 1.9

• For this and the remaining exercises, you must have the image manipulation procedures.

• Make sure that you have successfully setup graphics capabilities by completing the previous lab DrRacket Installation and Setup (see menu at left).

• The test file defines some images and tests your half-turn, quarter-turn-left, and side-by-side procedures with:

      (half-turn test-bb)

  which should show a triangle pointing down,

      (quarter-turn-left test-bb)

  which should show a triangle pointing left, and

      (side-by-side test-bb (half-turn test-bb))

  which should show a triangle pointing up to the left of a triangle pointing down.