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36² = 39² - (R-6)²
1296 = 1521 - (R-6)²
(R-6)² = 1521 - 1296
R-6 = √225
R = 15+6
R = 21 cm
Garis singgug persekutua luar : ↓
R - jr =>
R - 6 =>
R - 6 =>
R - 6 =>
R - 6 => 15
R => 15 + 6
R => 21 cm².
Semoga membantu ya.