an equilateral triangle
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180 Two angles are 45 degrees and between them the third angle is 90 degrees.
Left triangle.
S=180n-360
Let side opposite the 60 degree angle be "N" Then N/17 = sin 60 degrees or N = 17 x sin 60 = (17/2) x Root of 3 = 8.5 x 1.732 = 14.722
A triangle has 180 degrees, a rectangle has 360, a pentagon 540 etc. So the # of degrees = (number of sides - 2) * 180. So 3600 = 180 ( N - 2) means 20 = N - 2 so N = 22. A 22-sided polygon will have 3600 degrees.