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K pp= 126
K set.ling = 1/2 x 2 x 22/7 x 7
= 22
K daerah yang diarsir : 126 - 22
= 104
tolong di jadiin solusi terbaik boleh gak?.__.v
keliling p. panjang= (25x2) + (18x2) = 86
keliling 1/2 lingkaran= 1/2 x 2 r
= 1 x 2 x 22 x 7
2 7
= 22
k= 86-22= 64