7. [1] The height of a right triangle is increasing at a rate of 1 while the area of the triangle is increasing at a rate of 2. Find the following rates of change when the height of the triangle is 10 and the area is 50. heght base (a) Find the rate of change of the base of the triangle. (b) Find the rate at which the angle between the base of the triangle and the hypotenuse of the triangle is changing