Use the formula for the area A of a triangle:
You don't even need calculus to find the angle that maximizes A...
I'm currently struggling with the following question from my textbook.
"Points A and B lie on a circle, centre O, radius 5 cm. Find the value of angle B that produces a maximum area for triangle AOB."
I know that I need to find the area and then the derivative and set it to zero but I'm not sure how to find the base and height of the triangle to get the area.