32cm, the radius is half of the diameter
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64cm.
It is: 64/4 = 16 cm
It is: 4*2 = 8 square cm
No because the given dimensions do not comply with Pythagoras; theorem for a right angle triangle.
This all depends on the type of the shape given. There is no way to determine the exact area of the shape. If the shape is a rectangle with that dimension, then A = length x width = 64 cm x 36 cm = 2304 cm²