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18 = 5 + s
13 = s
t = √ 169 - 25 = 12 cm
r = 5 cm
dit : t
jawab
l.permukaan = phi r (r+s)
282,6= 3,14 x 5 (5+s)
90 = 5 (5+s)
5s = 90:5
5s = 18
S = 18-5
S = 13
T² = S² - r²
T² = 169 - 25
T² = 144
T = 12 cm