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L=πr²
=22/7.21.21
=1386 cm²
mencari L. juring
luas juring/1386=60/360
luas juring/1386=1/6
luas juring=231 cm²
L.segitiga AOB
L.=1/2.a.t
L=1/2.21.21
L=220,5 cm²
L. tembereng=L.juring-L.segitiga
=231-220,5
=10,5 cm²