Aplane flying at an altitude of 3.0 mi is at a direct distance dequalsstartroot 9.0 plus x squared endroot from an airport control tower, where x is the horizontal distance to the tower. if the plane's speed is 380 mi/h, how fast is d changing when xequals6.6 mi?

With these 5 geometry questions! pls 1.)quadrilateral abcd is inscribed in this circle. what is the measure of ∠a ? enter your answer in the box.°2.)quadrilateral abcd is inscribed in a circle. what is the measure of angle a? enter your answer in the box. m∠a= 3.)quadrilateral abcd is inscribed in this circle. what is the measure of angle b? enter your answer in the box. m∠b= °4.)quadrilateral abcd is inscribed in this circle. what is the measure of angle a? enter your answer in the box.°5.) quadrilateral abcd is inscribed in this circle. what is the measure of angle c? enter your answer in the box.°