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16 = 3,14 x jari"
jari= 16/3,14
jari" = 5,09
keliling= 2 pi x jari"
= 2x3,14x5,09
=31,9 cm2
TT^2 = 16 / 3.14
TT^2 = 5.09
kel = 2 × 3.14 × 5.09
= 31.9