Look at the function to calculate the next y$-$position for drawing a set of shapes. This function is called near the bottom of the program: # Draws $3$ sets of shapes of related sizes

# Draw a rectangle

# Draw a triangle with sides the same size as rectangle length

# Draw a filled circle with the same area as the rectangle

# Draw a triangle with the same area as the rectangle

# Draw a filled circle with the same diameter as the previous triangle side

import turtle

import math

def next$\_$y$\_$position$($y$,$ht$)$:

$"""$ Returns the next y$-$position, given current position y and height ht $"""$

next $=$ y $+$ ht $+30$

return next

def drawRect$($t$,$ len, wid$)$:

$"""$ Draws a rectangle using turtle t with sides len and wid $"""$

for side in $[$len$,$ wid, len, wid$]$:

t$.$forward$($side$)$

t$.$left$(90)$

def drawFilledCircle$($t$,$ rad$)$:

$"""$ Draws a filled circle of radius rad using turtle t $"""$

t$.$begin$\_$fill$()$

t$.$circle$($rad$)$

t$.$end$\_$fill$()$

def main$()$:

# named constants

screen$\_$size $=500$

screen$\_$startx $=60$ # x coordinate of the left edge of the graphics window

# Set up the window and its attributes

wn $=$ turtle.Screen$()$

wn$.$setup$($screen$\_$size, screen$\_$size, screen$\_$startx, $0)$

wn$.$bgcolor$("$yellow$")$

axel $=$ turtle.Turtle$()$

axel.speed$(7)$

# Initial turtle position near left edge, toward the bottom

xpos $=-$screen$\_$size$/2+20$

ypos $=-$screen$\_$size$/2+50$

axel.up$()$

axel.goto$($xpos$,$ypos$)$

axel.down$()$

# y$-$dimension of each rectangle

width $=50$

# draw three sets of shapes $-$ same width$($y$-$dimension$)$ but different lengths

for length in $[25,55,75]$:

# Draw the rectangle

drawRect$($axel$,$ length, width$)$

# Here's code to draw a rectangle $-$ before putting in a function

#for side in $[$length$,$ width, length, width$]$:

#axel.forward$($side$)$

#axel.left$(90)$

# Draw an equilateral triangle with sides the same as rectangle length

for $\_$ in range$(3)$:

axel.forward$($length$)$

axel.left$(120)$

# Move a little to the right of the rectangle

axel.up$()$

axel.forward$(2*$length$)$

axel.down$()$

# Draw a circle with the same area as the rectangle

radius $=$ math.sqrt$($length$*$width$/$math$.$pi$)$

drawFilledCircle$($axel$,$ radius$)$

#axel.begin$\_$fill$()$

#axel.circle$($radius$)$

#axel.end$\_$fill$()$

# Move a little to the right of the circle

axel.up$()$

axel.forward$(2*$radius$)$

axel.down$()$

# Draw an equilateral triangle with same area as rectangle

tri$\_$side $=$ math.sqrt$($length$*$width$*4/$math$.$sqrt$(3))$

for $\_$ in range$(3)$:

axel.forward$($tri$\_$side$)$

axel.left$(120)$

# Move a little to the right of the triangle

axel.up$()$

axel.forward$(2*$tri$\_$side$)$

axel.down$()$

# Draw a circle with the same diameter as the triangle side

axel.begin$\_$fill$()$

axel.circle$($tri$\_$side$/2)$

axel.end$\_$fill$()$

# Calculate the next vertical position for a set of shapes

ypos $=$ next$\_$y$\_$position$($ypos$,$ tri$\_$side$)$

# Put turtle to left side of screen at correct height

axel.up$()$

axel.goto$($xpos$,$ypos$)$

axel.down$()$

# Close window nicely after loop finishes

wn$.$exitonclick$()$

# Run the main function. This should be the last statement in the file.

main$()$