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Exercises 20.8 Chapter Exercises

1.

The code currently draws a square. Change it so that it draws a triangle. Do so by modifying the loop and the turn that the turtle makes without modifying other code.
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Remember that to make a complete shape, the turns must sum to 360 degrees.
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2.

Fix the errors in the code so that it draws an octagon. Do so by fixing the issues in the loop-based code. There are three issues to fix.
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Remember that to make a complete shape, the turns must sum to 360 degrees.
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3.

Fix the indention in the code below to correctly draw 20 pentagons (5-sided polygons).
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Make sure to use four spaces for each indentation level (the tab key will automatically use 4 spaces).
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4.

Which is range recipe would generate the sequence: 10, 8, 6, … 2
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  • range(10, 0, -2)
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  • Correct
  • range(10, 1, 2)
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  • That counts up by 2’s
  • range(10, 2, -2)
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  • That recipe would not generate 2 because it is the stop value
  • range(10, 3, 2)
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  • This recipe counts up by 2’s
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5.

Write the correct recipe to fill in the ____________ in the code below to generate the pattern 5, 25, 45, … 105. Use the smallest possible value for your stopValue.
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range(____________)
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Just write what would replace the blank below. (Don’t include “range” or the parentheses in your answer; do include commas).
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6.

We want to make a series of rectangles such that the first one is 10x90, the next is 20x80, the next is 30x70, … until we draw one that is 90x10. Doing so will make a “staircase grid” like the one shown below:
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Below is a program with rectangle already defined. Add code that uses a for loop to call the procedure with the correct values for its parameters. Make sure that the 90-width and 10-height rectangle is the first one you draw. You should only need one loop and it must count down from 90 to 10.
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Hints:
  • Start by writing a loop that just prints out the values 90, 80, 70, …, 10. These will be the widths of the rectangles you end up drawing.
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  • Next, for each width, calculate the corresponding height. Each width/height pair should always add to 100, so if we call the width \(w\text{,}\) the height must be \(100 - w\text{.}\) Print out the height with the width so that your output looks like 90 10, 80 20, 70 30, …, 10 90.
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  • Finally, call rectangle in your loop and pass it the width and height you are calculating.
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The autograder will not verify everything about your program. It is up to you to determine if your program is correct or not.
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