Aplane rises from take-off and flies at an angle of 4° with the horizontal runway. when it has gained 450 feet, find the distance, to the nearest foot, the plane has flown. an airplane is at vertex b of a right triangle that has a horizontal side a c, a vertical side b c of length 450 feet, and a dashed hypotenuse a b of unknown length c that rises from left to right. angle c is the right angle and angle a measures 4°.