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2.15.5 Phone Signal CodeHS Answers

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The most common answer is:

speed(0)
def rectangle():
forward(10)
right(90)
forward(i)
right(90)
forward(10)
right(90)
forward(i)
right(90)
penup()
forward(25)
pendown()
right(180)
for i in range(10,51,10):
rectangle()

This code intends to create a sequence of rectangles that resemble a phone signal strength indicator, with each rectangle increasing in height. However, there’s a small issue with the scope of the variable i and its use inside the rectangle function. The rectangle function doesn’t have access to i because it’s not passed as a parameter.

To fix this, you can modify the rectangle function to accept a parameter that controls the height of the rectangles. Also, the turtle’s direction at the end of drawing each rectangle needs to be adjusted to ensure the next rectangle starts from the correct position.

Here’s the corrected version of the code:

import turtle

turtle.speed(0)  # Set the drawing speed to the fastest

def rectangle(height):
    for _ in range(2):
        turtle.forward(10)  # Width of the rectangle
        turtle.right(90)
        turtle.forward(height)  # Height of the rectangle, passed as an argument
        turtle.right(90)
    turtle.penup()
    turtle.forward(15)  # Space between rectangles
    turtle.pendown()

turtle.penup()
turtle.goto(-50, 0)  # Start position to make sure rectangles are visible in the window
turtle.pendown()

for i in range(10, 51, 10):  # Increase the height of each rectangle by 10
    rectangle(i)

turtle.done()  # Keep the window open until manually closed

This code correctly defines a rectangle function that draws a rectangle based on the given height. It then uses a loop to draw rectangles with increasing heights, starting from 10 units up to 50 units, with each rectangle being wider than the previous one. The turtle’s position is adjusted before drawing each new rectangle to ensure they are drawn side by side with a space of 15 units between them.

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