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225 = 22/7 x r²
225 = 3,14 x r²
r² = 225/3,14 =71,6
r = (akar dari 71,6) 8,4 cm
t²=s²+r²
= 16²+8,4²
= 246+70,56 = 316,56
t = (akar dari 316,56 ) = 17,7 cm
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