13.1.1 Half Pyramid Write a program that fills half the canvas with circles in a diagonal formation. Have Tracy draw circles along the width of the canvas on the bottom row. Have the number of circles decrease by 1 on each iteration until there is only 1 circle on the top row. Follow these guidelines: - Use a radius value of 25 pixels for all circles - Create a variable called circle_amount that keeps track of how many circles should be in each row. Hint: The bottom row should start with 8 circles!