shapes.py

In a computer program a function can be used many times, just like a
variable, with different input values and different output values possible.
In modular programmimg and object-oriented programming, hundreds or even thousands
of functions can be "called" by a main program, such as a large program that
calculates your Federal IRS 1040 Income Tax each year. The program has to be
updated each year for changes in the current year tax laws.

shapes.py

@@ -5,7 +5,19 @@
 from turtle import *
 
 def triangle(side_length):
-    pass
-
+    forward(side_length)
+    right(120)
+    forward(side_length)
+    right(120)
+    forward(side_length)
+    right(120)
+    
 def rectangle(height, width):
-    pass
+    forward(width)
+    right(90)
+    forward(height)
+    right(90)
+    forward(width)
+    right(90)
+    forward(height)
+    right(90)