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=1/6 x 2 x 22/7 x 7
=1/6 x 44
=7,3 cm
luas juring a/360 x πr²
=60/360 x 22/7 x 7 x 7
=1/6 x 154
=25,6cm²
luas juring 300/360.22/7 . 7.7= 128,3