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Solution 4.1:9

From Förberedande kurs i matematik 1

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10 seconds corresponds to 1/6 minutes, so that during that time period, the second hand sweeps over 1/6 of a turn, i.e. the sector of a circle with angle

=612 radians=3 radians.
Image:4_1_9_.gif

The area of the sector is

Area=21r2=213(8 cm)2=332 cm233.5 cm2.
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