New feature : draw straight lines to the scratchpad when taking tests

Hi Ader!

Thanks for sharing your thoughts on how we could improve our scratchpad by adding tools for better drawings and shapes. We are always working to add features that improve our site, and we love getting input from our community.

I've passed your feedback along to the team and it will be part of our conversation as we plan the future of Khan Academy.

Thanks for helping improve Khan Academy!