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31,4 / 2
15,7
K = 20+20+5+5+5+5+15,7
= 75,7
= 2 ( 20 + 10 )
= 2 x 30
= 60cm
K.1/2 lingkaran = 2 x 3,14 x 5
= 31,4cm
Keliling seluruhnya = 60 + 31,4
= 91,4cm