a door opening is 2 meters high if there is a 39 centimeter gap between the top of his head and the top of the door opening how tall is Casey in centimeters

So 1 meter is equal to 100 centimeters. Therefore if the door is 2 meters tall, it is 200 centimeters tall.

If there is 39 centimeters of space between his head and the top of the door that means the rest of the 2 meters is his height.

So we do 200 centimeters - 39 centimeters = 161 centimeters.

He is 161 centimeters tall