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# 2.15.5 Phone Signal CodeHS Answers

``````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.