What is the smallest angle of rotational symmetry that maps a regular pentagon onto itself?
2 answers:
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92
29
———
first times 9 by 2 then 9 by 9
then add a 0 for the second colum as a place holder then 2 times 2 and 9 times 2 add the two colums together
29
———
first times 9 by 2 then 9 by 9
then add a 0 for the second colum as a place holder then 2 times 2 and 9 times 2 add the two colums together
You could do all of the work with the multiplying, but what I think it wants you to see is that you can divide like numbers by subtracting exponents.
so if we did that we would get
this in turn would give us 4 x -9 x -5 = 180