Any simple harmonic motion is of the form x(t) = A cos(w t + a). Here the constant A with dimension [x] is called the amplitude.
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The absolute value of the distance "crest to trough" perpendicular to the direction of propagation of the motion.
There is no simple way. You could use published tables but I don't suppose that is what you meant.
8.6 is simple enough. If you meant the simplest fraction form, the answer is 86/10 = 43/5
The word "meant" has one syllable.
As squared meters are two-dimensional and cm are one- dimensional it is not possible. If you meant cm squared then: 1 Meter squared = 10000 Centimeter squared. Using this you can use simple multiplication to convert.