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K : K
=2*phi*r : 2*phi*r (kedua phi sama2 dicoret)
=2*8 : 2*10
=16:20
=4:5
3.
lingkaran penuh sudut 360˚..klo dibagi 4 berati tiap bagian = 360˚:4=90˚
l.o 1 = 100Π
l.o 2 = 64Π
tinggal kurang 100Π-64Π= 36Π