Draw a triangle (with a loop)

Challenge Level: Beginner

Learning outcomes

Students will be able to:

Explain how sequence works in programming.
Computer Science: Programming
Explain why a program gives the output that it does.
Computer Science: Programming
Identify how and when to use a loop to repeat a set of instructions.
Computer Science: Programming

Requirement:

Write a program that draws a triangle (with equal sides), starting from point x:0, y:0, with its sides equal to 100 steps. You must use a repeat loop for this challenge.

Testing examples:

There are no testing examples for this challenge.

Languages

Scratch

What it should look like

Click on the green flag to see the expected output of your program.

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Recommended blocks

when green flag clicked

clear

pen down

pen up

move (100) steps

turn cw (120) degrees

wait (1) secs

repeat (3)
end

Hints

A triangle has 3 sides and 3 angles (all 3 angles always add up to 180 degrees). A equilateral triangle has 3 equal sides and 3 equal angles.
Block wait () secs waits specified number of seconds, then continues with next block. To be able to see each sides of the triangle being drawn, use the wait block after turning each angle.

Show Scratch solution

Extra Challenge

Extra challenge #1: Write a program that takes the length of a side of a equilateral triangle (a triangle in which all three sides are equal) as the input, draws the triangle with the given side and displays its perimeter as the output.