### Value of Theta: Maximum Area of Triangle

An isosceles triangle has two equal sides of length 10cm. Let theta be the angle between the two equal sides. The Area of the triangle can be expressed as: A(theta) = 50sin(theta) If theta is increasing at the rate of 10 degrees per minute (pie/18 radians per minute)and the derivative of the area is [50cos(theta)]at what valu