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r^2 = s^2 - t^2
r^2 = 26^2 - 24^2
r^2 = 676 - 576
r^2 = 100
r = 10
Sisi kerucut = Luas selimut
L. Selimut = P * r * s
= 3,14 * 10 * 26
= 816,4 cm^2.