That is part of a psychology knownas "gestalt psychology", first promoted around 1900 by Christian von Ehrenfels. Its premise is that "the whole is greater than the sum of its parts"
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First, work out the sum of all numbers and divide by three. 1+2+3+4+5+6+7+8+9+10+11+12=78. 78/3=26. This means each part needs to equal 26. To get equal parts you need to divide the clock into thirds. 11+12+1+2=26, 5+6+7+8=26, leaving 10+9+3+4=26 in the middle.
The exterior angles of polygons equal 360 degrees.
The sum of all of the angles in a trapezoid is 360 degrees. The sum of interior angles for an n-sided polygon is equal to 180(n-2) which, in this case, is 180(4-2) = 360.
the sum of the angles of a trapizoid equal 360 degrees.
The sum of all 30 interior angles would equal 5040*.