What is “x” in This Equation? Math Challenge!

Can you find the area of this red half circle? Try it in your paper and compare it to my way. Please leave your comments and opinions here. Subscribe my channel to find a lot of interesting math and geometry questions:    / @mymathplanet   #maths #mathematics #math #mathstricks #geometry #matheducation #educational #education #satmath #learning #mathpuzzle #algebra #exam #calculation #mathtutorial #learnmath #geometryproblems #studymaths #problemsolving #geometrychallenge #academicchallenge