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If the radius of a circle is tripled, how is the length of the arc intercepted by a fixed central angle changed?
It depends on the size - length x width x height.
You are essentially asking how many different bit strings of length 9 are there, as the first 3 bits are fixed. The answer is 2^9 = 512.
Any length greater than 9 cm.
fixed perimeter is the perimeter being fixed