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36² = 39² - (r1 + r2)²
(r1 + r2)² = 1521 - 1296
(r1 + r2)² = 225
(r1 + r2) = 15
4 + r2 = 15
r2 = 11
d^2=p^2 - (r1+r2)^2
36^2=39^2 - (4+ r2)^2
(4+2)^2 = (39^2)-(36^2)
(4+r2)^2= 1521 - 1296
(4+r2)^2 = 225
4+r2= 15 ( diakarin)
r2= 15-4
r2 = 11