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15² = p² - (5-3)²
225 = p² - 2²
225 = p² - 4
p² = 225+4
p = √229 cm
d² = p² - (R+r)²
15² = p² - (5+3)²
225 = p² - 8²
225 = p² - 64
p² = 225+64
p = √289
p = 17 cm
Sepertinya jika soalnya garis singgung persekutuan dalam baru ada jawabannya di pilihan