Where is angles hiding in Scratch pen polygons?

Quick answer

In Scratch, you can draw polygons like triangles, squares, and pentagons by using the pen tool with repeated commands and specific turn angles. Each polygon has a certain number of sides and angles, and you can make the pen move and turn to create these shapes.

Learning outcome

By the end of this page, you will be able to draw simple polygons like triangles, squares, and pentagons in Scratch by using the pen tool with the correct turn angles and repeated commands.

• You can use the pen tool to draw lines in Scratch
• You know the turn angles needed for triangles, squares, and pentagons
• You can use repeated commands to make your shapes
• You can create a polygon by combining forward moves and turns

Why this matters

Understanding how to draw shapes in Scratch helps you learn about angles and patterns in a fun way. When you make shapes in Scratch, you are using the same thinking as when you build with blocks or draw with a compass. This helps you understand how geometry works in the real world, whether you're designing a garden, planning a room, or playing a game. It also helps you learn how to give instructions to a computer, which is a useful skill for many jobs in the future.

How it works

When you draw a polygon in Scratch, you use a few key commands:

1. Move the sprite forward
2. Turn the sprite by a certain angle
3. Repeat this process a number of times equal to the number of sides

Each time you turn, the angle depends on how many sides your shape has. For example, to draw a triangle, you turn 120 degrees each time. To draw a square, you turn 90 degrees each time.

Examples you can see

Let's look at how to draw a triangle, a square, and a pentagon in Scratch:

Triangle

Square

Pentagon

Try it as a mini adventure

Imagine you are a robot explorer on a mission to draw all the shapes of the ancient world! Your spaceship has a special pen that can draw shapes. You must use the pen to draw a triangle, a square, and a pentagon. Here's your mission:

1. Start with your pen down
2. Draw a triangle by moving forward and turning 120 degrees three times
3. Draw a square by moving forward and turning 90 degrees four times
4. Draw a pentagon by moving forward and turning 72 degrees five times

As you draw, you can change the pen colour to make each shape stand out. Try to make your shapes as neat as possible!

Common mistakes

• Mistake: Forgetting to turn the correct angle for each shape
  Why it happens: The angles are not remembered, or the shape is confused with another.
  Fix: Make a chart or list of the angles to help you remember.
• Mistake: Not repeating the commands enough times
  Why it happens: Children may think they only need to do the command once.
  Fix: Count the sides of the shape and repeat the commands that many times.
• Mistake: Turning the wrong way (left or right)
  Why it happens: Confusion about which direction to turn.
  Fix: Always turn the same way (e.g., always turn right) for consistency.
• Mistake: Using the wrong pen size or colour
  Why it happens: Thinking that the pen tool is only for drawing lines.
  Fix: Use the pen size and colour options to make your shapes look nice and clear.

Parent and carer guide

Helping your child with this Scratch activity can be fun and rewarding. Here are a few tips:

• Encourage your child to first draw the shapes by hand to understand how many sides and angles each shape has
• Ask questions like: "How many sides does a triangle have?" or "What angle do you turn for a square?"
• Let your child experiment with different pen colours and sizes to make their shapes look interesting
• Try to make it a game by seeing who can draw the most shapes correctly
• Remember to celebrate small wins – drawing a perfect shape is a big achievement!

It's okay if your child makes mistakes. These are learning opportunities. Don't rush to correct them – instead, ask guiding questions to help them think through the problem.

Practice questions

1. What angle do you turn for a triangle?
2. How many times do you repeat the commands to draw a pentagon?
3. What angle do you turn for a square?
4. How many sides does a pentagon have?
5. Which direction should you turn to draw a polygon in Scratch?

Answers:

1. 120 degrees
2. Five times
3. 90 degrees
4. Five sides
5. Right (or left, as long as it's consistent)

FAQ

What is a polygon?

A polygon is a shape made of straight lines that are connected to form a closed figure. Examples include triangles, squares, and pentagons.

Why do we need to turn a specific angle?

Turning the correct angle ensures that the lines connect to form a proper shape. If you turn too much or too little, your shape will not close properly.

Can I draw other shapes in Scratch?

Yes! You can draw any polygon by using the correct number of sides and the right turning angle. For example, a hexagon has 6 sides and you turn 60 degrees each time.

How do I make my shapes look better in Scratch?

You can change the pen size, colour, and even add sounds or animations to make your shapes more interesting and fun to look at.

What if I don't know the angle for a shape?

You can calculate the angle using the formula: 360° divided by the number of sides. For example, a pentagon has 5 sides, so 360° ÷ 5 = 72°.