Go Graphic

# Online Tutorial -CG50: Draw Graphics Using Polar Coordinates

## Video Transcript

In this tutorial, we'll be looking at how to perform matrix and vector calculations. You can do this in a quick way or you can store the matrices and vectors in case you need to use the same ones more than once. This tutorial demonstrates both methods. To work along with the tutorial, you may find it easiest to reset the calculator before starting so that your screen matches the one in the video.

Looking at the quick method first, choose run mode. Go to math, rather than matrix vector on the first menu, but choose matrix vector from the next menu. Two by two gives the metrics template. Type the values, scrolling rather than using execute to complete the matrix. Scroll right to enter a second matrix, then two by two and enter the values, and execute.

I'm changing the settings to start at 0 and end at 2 Pi and I'm going to use Pi over six for my step size - but you may find that Pi over 24 may be more useful elsewhere. Execute and create a table. Scroll down to view the values of R. Remember, we're looking for the values of Theta, which gift positive values for R. So we need the values of Theta between Pi over 3 and 5 Pi over 3. Return to graph mode. Draw and enter these values, into view window. And now only positive values of R are shown.

Restore the settings for Theta back to 0 and two Pi. And then delete the first equation. Type in the new equation using alpha and a for the letter a. Use modify to draw and scroll to the right to change the values of a.

Investigate the difference when only positive values of R are drawn. The polar versions of the conic section graphs are also given in the conics menu. You can find additional resources at education.casio.co.uk.