Please show us how to make and use "Draw Square" custom block using the Pen extension?

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To draw shapes in Scratch, we first need to unlock a "hidden" set of tools called the Pen Extension. This turns your sprite into a virtual pen that leaves a trail wherever it moves.

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1. Add the Pen Extension

Since the Pen blocks aren't in the default sidebar:

1. Click the "Add Extension" button (the blue icon at the very bottom-left corner of the screen).

2. Select "Pen." 3. You will now see a new green category of blocks!

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2. Create the "Draw Square" Block

Now, let's use what we learned about My Blocks to create a custom command.

1. Go to the pink My Blocks category and click "Make a Block."

2. Name it Draw Square.

3. Click "Add an input (number or text)" and name it size. This allows you to draw squares of any size!

4. Click OK.

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3. Define the Logic

A square has four equal sides and four $90^\circ$ turns. Here is how you define that logic under your new pink Define hat:

1. pen down (Put the pen on the paper)

2. repeat (4)

   • move (size) steps (Use the size input bubble here)

   • turn clockwise (90) degrees

3. pen up (Lift the pen so it stops drawing)

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4. Using the Block in a Script

Now that you've "taught" Scratch how to draw a square, you can use that command anywhere.

Try this script:

1. When 🚩 clicked

2. erase all (Clear the screen from previous attempts)

3. go to x: (0) y: (0) (Start in the middle)

4. Draw Square (50) (Draw a small square)

5. go to x: (100) y: (100)

6. Draw Square (100) (Draw a larger square)

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Pro Tip: The "Rainbow" Square

If you want to make it look cool, add a change pen color by (10) block inside the repeat loop of your definition. This will make each side of the square a different color!

Geometric Math: To draw a triangle instead, you would repeat 3 times and turn $120^\circ$. To draw a circle, you would repeat 360 times and move 1 step while turning $1^\circ$.

Would you like to know how to use the "Ask and Wait" block so the user can type in the size of the square themselves?

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