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13. 3/5×240=144:4=46 detik ( b )
14. L=pi × r × r = 22/7×21×21 = 1,386 ( a )
15. L = 3/4 × pi × r × r = 3/4×3,14×10×10= 3/4×314= 235,5 ( c )
16. a.25