help me with number 2, thank u so much!

2. An isosceles triangle is inscribed in a circle the radius of which is 10 cm. a. Find all angles of the triangle, maximizing the area of the triangle. b. Determine the maximum area of the triangle. (2K, 4T, 2C) 3. Determine the shortest distance from point A (3, 0) to the parabola y = x (2K. 4T. 2C) If AB is the shortest line segment from the point A to the