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= 1/6 . 22/7 . 21 . 21
= 1/6 . 1386
= 231 cm2
luas = 60/360 x π x r²
= 1/6 x 22/7 x 21 x 21
= 1/3 x 11 x 3 x 21
= 11 x 21
= 231 cm²