A plane is flying in circles, the pilot flew around in the air at angle of 45 degrees. He’s in the air at 50,000 ft. He wants to land at a 15 degree angle. What would we have to land at?

what does it mean to

fly around in the air at angle of 45° ??

He always has his rudder set at 45° (left or right)?
Always flying at an up(down)ward angle of 45° ?

What are the conditions of his descent?

In short -- eh?