pythagorean theorem

triangles diagram graph analysis computation surface physics theoretical maths chalk triangular theory calculus knowledge vintage solve object student euclidean geometry icon isolated modern design side right triangle simple drawing law shape intelligence background perimeter technical rightangled line fundamental geometrical pythagora mathematician symbol sign studying lesson class vector lecture algebra classroom colorful mathematical math formula equation school pythagoras education science theorem trigonometry teach learn figure pythagorean calculate mathematics study college geometric equals square equal hypotenuse proof angle