No way of telling, it depends on the angle of the sun.
Any height.
When the Sun is low, in the morning or evening close to the horizon, even a short object will cast a long shadow. When the Sun is directly overhead (at noon between the Tropic of Capricorn and the Tropic of Cancer) objects cast no shadow.
If you tell us your location and the time you are measuring then there would be a possibility of calculating an answer.
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48 inches
There are 48 such squares.
It should be tall enough to satisfy your local code. In most places that 40 to 48 inches high with ballusters that are no more than 4" apart.
48 degrees since congruent basically means the same
84+48=132 - 180 = 48 degrees The Answer is 48 Degrees.