I think that inches would be most common for height but centimeters and feet could also be used.
36....we need to break this down...12 * 3 = 36
12 * 3....we can break this down because 12 is not prime...4 * 3 = 12
4 * 3 * 3...we can break the 4 down because it is not prime
2 * 2 * 3 * 3 <==== prime factorization
Yes because all equilateral triangles have equal angles and side lengths so they are all similar. hope i helped -J
