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Final answer:To create a growing and shrinking circle using key events, you can use the p5.js library. Set the initial radius to 100 and position to (250, 250). Use the keyPressed() function to detect the left and right arrow keys and adjust the radius accordingly. Draw the circle on the canvas using the ellipse() function.Explanation:To create a program that makes a circle larger and smaller using key events, you can use the p5.js library. Start by creating a canvas with a size of 500x500 pixels. Set the initial radius of the circle to 100 and the position to (250, 250).Next, you can use the keyPressed() function to detect when the left or right arrow keys are pressed. When the left arrow key is pressed, decrease the radius of the circle by 10. When the right arrow key is pressed, increase the radius by 10. Finally, use the ellipse() function to draw the circle on the canvas with the updated radius.Here's an example of how the code would look:function setup() {createCanvas(500, 500);}let radius = 100;let positionX = 250;let positionY = 250;function draw() {background(220);ellipse(positionX, positionY, radius * 2, radius * 2);}function keyPressed() {if (keyCode === LEFT_ARROW) {radius -= 10;} else if (keyCode === RIGHT_ARROW) {radius += 10;}}...