The length of a Boeing 747 airplane is 231 ft. What is the plane's altitude if it subtends an angle of = 6° when it is directly above an observer on the ground? See the figure below. (Round your answer to the nearest whole number.)

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm