l² = p² - (r1 - r2)²
15² = p² - (6 - 4)²
15² = p² - 2²
225 = p² - 4
p² = 225 + 4
p² = 229
p = √229 cm
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l² = p² - (r1 - r2)²
15² = p² - (6 - 4)²
15² = p² - 2²
225 = p² - 4
p² = 225 + 4
p² = 229
p = √229 cm