How do you show space on a 2D surface?

How did yang hui apply to math? What is 3 and one fourth multiplied by 2? How many is 1 plus 1? How many times larger is4900 than4.9? What is the name of fractions that have the same denominator? What is the formula for a 90 degree rotation? How many sq ft in 3.3 acres? What number is between 4530 and 4610? Does wind move in a straight line? How many rakaats in zuhr? What does a right angle triangle equal to? Is sum adding or subtracting? I am a 4 digit number. the thousand digit and the ones digit is the same what is the number? How do you round 173.29 to the nearest tenths? How can I abbreviate one million dollars? Why is 2 the first even prime number? A cube is painted red and then cut into 64 little cubes all of the same size how many of the little cubes have 6 red faces 5 red faces 4 red faces 3 red faces 2 red faces 1 red face? Hands of clock make 90 degree angles? Is area a derived quantity? Where can you get a wall clock with over-sized hands like the one in Mario Batali's TV Kitchen?