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Draw a Shape Step by Step

Drawing a square is an algorithm too. Four lines, four turns, done. Change one step and you get a triangle or a mess.

Class 3 to 5beginner15 min3 lessons
By the end you will be able to
  • Draw a simple shape using numbered moves
  • Tell forward and turn apart as separate steps
  • Predict the picture after each step

Finish first

Lesson 1 of 3

Lines and turns

Imagine a turtle with a pen on paper. Forward means draw a straight line. Turn right means spin in place without drawing. Each command is one step.

A square needs four forwards and four turns. Same length each side, same turn each corner. Repeat the pattern four times and the shape closes.

Watch the step-flow animation. See the pen walk a square one edge at a time.

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Lesson 2 of 3

Predict the picture

Before you draw, trace the steps in your head. After step two, which way does the pen point? After step four, how many sides exist?

If you turn left instead of right once, the whole shape flips. One wrong step early changes every line that follows.

Try a triangle: three forwards, three turns of sixty degrees if your tool allows. Fewer repeats, different shape, same planning idea.

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Lesson 3 of 3

From paper to robots

Robot grids in coding class use the same commands. Forward and turn are instructions a machine can follow without guessing.

Artists sometimes plan big murals on graph paper first. Each square is one step. Computers use tiny squares called pixels for the same reason.

Next you will plan cleaning a room in zones. Big messy jobs also work better as small drawn steps.

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Practice

Work these out yourself

No answer key here on purpose: these are the questions worth thinking through before you move on. Open one and work it out.

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Assessment

Check your understanding

Answer each question, then read the explanation. That is where the learning is.

0/4
  1. Question 1: In draw steps, forward usually means what?
    Question 1 / 4

    In draw steps, forward usually means what?

    Select an option first
  2. Question 2: A square plan needs how many forward lines?
    Question 2 / 4

    A square plan needs how many forward lines?

    Select an option first
  3. Question 3: One wrong turn early does what?
    Question 3 / 4

    One wrong turn early does what?

    Select an option first
  4. Question 4: Robot grids and drawing steps share what idea?
    Question 4 / 4

    Robot grids and drawing steps share what idea?

    Select an option first
4 of 4 questions left.

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