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= 60/360 x phi x r²
=1/6 x 22/7 x 21 x 21
= 1/3 x 11 x 3 x 21
= 11 x 21
= 231 cm²
= 60/360 × π × r²
= 1/6 × 22/7 × 21²
= 1/6 × 22/7 × 441
= 1/6 × 22 × 63
= 1/6 × 1386
= 231 cm²