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= 45/360 x 2 x 3,14 x 10
= 1/8 x 62,8
= 7,85 cm ( a )
10.LJ = α/360 x πr²
= 72/360 x 22/7 x 21 x 21
= 1/5 x 1386
= 277,2 cm² ( d )