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36² = 39² - (7+r)²
(7+r)² = 1521 - 1296
(7+r)² = 225
7+r = √225
7+r = 15
r = 15 - 7
r = 8
36 cm =
36 cm =
36 =
maka = 1521-1296
= 225
= 15 jadi mencari R2 = 15-7=8 cm