SolveMyMaths Action 2!

Creation of this resource was inspired by a [url=https://twitter.com/solvemymaths/status/990116214897823744]tweet[/url] posted by [url=https://twitter.com/solvemymaths]Ed Southall[/url]. [br][br]Take a look at the original problem below. [br]Try to solve this problem [b]WITHOUT [/b]interacting with the GeoGebra applet. [br][br]Once you do arrive at at solution (or if you're totally desperate and need a hint), feel free to slide the slider to check your solution (or get some insight...)[br]
THE PROBLEM:
VERIFY your solution or GET a hint:

Information: SolveMyMaths Action 2!