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31,4 : 3,14 × d
d : 31,4 : 3,14
d : 10 cm
¤》 d = 2r
r = 10 : 2 = 5 cm
¤> t^2 = s^2 - r^2
= 13^2 - 5^2
= 169 - 25
t^2 = 144
t = 12 cm
maaf klo agak ribet