Drawing Shapes
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As you saw in Lab 1.1, all of the in Snap are organized into categories. Each category is a different color. You can access each category by clicking on the tabs at the top left of the .
The blocks are categorized under each tab based on what each block does. The section includes a description of each category. It also includes an explanation of the functionality of each block within a category.
Before you start drawing shapes in Snap!, it is important to understand the difference between a polygon's interior angles and exterior angles.
A polygon's interior angles are the angles formed inside a polygon by two adjacent sides.
A polygon's exterior angles are the angles between the side of a polygon and an adjacent side extended outward.
The diagram below show the interior angles and exterior angles of an equilateral triangle, which is a triangle with three sides that are the same length:
[image below needs to be replaced with image that shows exterior angles as well, Kyle will replace]
。 09 。 09 Image Source: Wikimedia Commons
The exterior angles of an equilateral triangle are each 120 degrees. See the code below for an example of how to use this information to draw an equilateral triangle.
when' 2 ke ressed pen turn turn turn down 100 120 100 120 100 120
Press the play button below to see a demo of what this script does to the sprite happens when you press the "2" key on your keyboard:
[Add video/gif of sprite drawing triangle]
Note that the animate button is activated in this demo. Add description of animate button. (Kyle will add) The red arrow indicates the animate button.
Embed video of "triangle walk" somewhere
Exterior angles formula
Regular polygons are angles that have equal angles and equal sides. The sum of the exterior angles of a polygon is 360. Therefore, you can use this formula to determine the size of each exterior angle in a regular polygon:
360n
n = number of sides