Lesson: 16 - Pen

Purpose : Students learn various aspects of programming (Motion, Looks, Basic Events, controls along with pen).

Materials Required

Scratch 3.0

Curriculum Content Pen(6.7)

Prior knowledge

Students should know how to draw basic shapes and some idea of the length of sides and angles in basic shapes.

Exercises

Exercise:1


  1. Draw default shapes like square, rectangle, circle, triangle using the pen control in Scratch.

    2. Click here to view model output video for drawing default shapes.


    Click here to see the video of how to draw basic shapes with pen blocks.


    Optional:


    Exercise:2


  2. Draw a house by using different shapes like Triangle, Square, Rectangle, Circle.

    3. Click here to view model video for exercise - 2.


    Exercise:3


  3. Draw a rangoli by using shapes.

    4. Click here to view model video for exercise - 3.


Solutions


  • Click here to download the sb3 file to draw a circle.

  • Click here to download the sb3 file to draw a rectangle.

  • Click here to download the sb3 file to draw a square.

  • Click here to download the sb3 file to draw a triangle.

  • Click here to download the sb3 file for exercise 2.

  • Click here to download the sb3 file for exercise 3.


    • Teacher's Instruction
    1. Teachers should refresh the knowledge of basic properties of shapes - sides and angles of shapes before giving this exercise.
    2. Use the exercise to reinforce children’s understanding of basic shapes. Relationship between the length of various sides in various shapes. Challenge the students to draw a Rhombus or Parallelogram. Challenge them to draw a triangle other than an equilateral triangle. If the children know Pythagoras theorem, you can have them draw a right angle triangle and figure out what the hypotenuse will need to be. This will help them understand the shapes better.
    3. Urge the children to come up with smaller and “neater” code to achieve the result. This will require them to use loops effectively. Later this will also mean creating and using their own blocks.
    4. Observe that to draw a regular polygon with N sides, you will need to turn 360/N degrees. Why? The sum of the interior angles of a N sided polygon will always be (N-2) * 180 starting with triangles and quadrilaterals. You can help students understand that.