In a circle with radius $42\, cm ,$ an arc subtends an angle of measure $120$ at the centre. Find the length of this arc and the area of the sector formed by this arc.
In a circle with radius $42\, cm ,$ an arc subtends an angle of measure $120$ at the centre. Find the length of this arc and the area of the sector formed by this arc.
$88 cm , 1848 cm ^{2}$
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