237
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Factors are 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90.
12 & 45 = 57, as do 9, 12 & 36, 4, 5, 12 & 36 etc
You would add up all the angles.
Since 18 is a factor of 180, all of its factors are common.
No.
180 degrees
The 3 interior angles of all triangles add up to 180 degrees