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L.lingkaran K.lingkaran
L.juring = P.busur
πr² 2πr
L.juring = P.busur x πr²
2πr
L.juring = P.busur x r
2
L.juring = 60 x 20
2
L.juring = 600 cm²
Jadi, luasnya adalah 600 cm².
Itu jawabannya.