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Verified answer
Misal alas = xcos teta = x/p
2/3 = x/p
2p = 3x
x = ⅔p
p² = (⅔p)² + 5²
p² = 4/9 p² + 25
p² - 4/9 p² = 25
5/9 p² = 25
p² = 25 : 5/9
p² = 25 x 9/5
p² = 45
p = √45
p = √9√5
p = 3√5