Sum 13s

~Quarter turn~



13 x 1 = 13
13 x 2 = 26
13 x 3 = 39
13 x 4 = 52
13 x 5 = 65 ('bottom' up to here = 455) - 364 = 91 'steps'
13 x 6 = 78
13 x 7 = 91
13 x 8 = 104
13 x 9 = 117 +
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sum.......585

Bottoms up Cupcake...
117 + 104 + 91 + 78 + 65 = 455


455 - 364 = 91 'steps'
455 - 365 = 90 'degree'

585 - 365 = 220 (cc xx the twins lower case...MDCC LXXVI...)
585 - 364 = 221 +
===============
.......................441

21 square = 441
12 square = 144
sums........ = 585




13 x 10 = 130
13 x 11 = 143
13 x 12 = 156
13 x 13 = 169
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..............= 598