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289 = 225 + (r1 - 3)²
64 = (r1 - 3)²
8 = r1 - 3
11 cm = r1
(RA+3)²=17²-15²
(RA+3)²=289- 225
(ra+3)²= 64
RA+3=akar 64
RA+3= 8
RA=8-3
RA=5