1. Set the two coordinates: (1) on top set the CENTRE (2) on bottom set the RADIUS LIMIT (what fits in the confines of the stage). 2. Click CLEAR (to remove any previous drawing and to draw the triangle that sets the new radius). 3. Click DRAW (to draw from new centre to new radius) Here's what happens: (a) The coordinates are used to calculate the length of the line segments, horizontal (Cos) and vertical (Sine) of Angle at Centre (b) The Radius is calculated using the Pythagoras theorem Square Root of [x2 - x1]² + [y2 - y1]²
The simplified grids make it easy to replicate difficult concepts on on paper to link Scratch interactively with written work! It was an exciting achievement when my grids were added to the Backdrops. This should help students who find these concepts difficult. (The students don't need to understand the code). Having cracked the SCRATCH code to simplify Pythagoras, it took me several months to apply it to Trigonometry. There are many more shared examples by ReadySteadyCode. For PDFs, go to the Files folder of Facebook group Ready Steady Code - Scratch for Your Kids or Teaching with Scratch.
