A seminar runs from the time on the left clock (morning) to the time on the right clock (afternoon). The hour hand is 4.2 cm long. What area does the hour hand sweep during the seminar? (Take \π = 227.)

Question

Accepted Answer

23.1 cm². From 8 a.m. to 1 p.m. is 5 hours, so the hour hand turns 5×30^°=150^°. Area of the sector = 150360× 227×4.2^2= 512×55.44=23.1 cm². (11 is the arc length in cm; 55.44 cm² is the whole circle.)

A seminar runs from the time on the left clock (morning) to the time on the right clock (afternoon). The hour hand is 4.2 cm long. What area does the hour hand sweep during the seminar? (Take $π = \frac{22}{7} .$ )

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A seminar runs from the time on the left clock (morning) to the time on the right clock (afternoon). The hour hand is 4.2 cm long. What area does the hour hand sweep during the seminar? (Take π=722​.)

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More Clocks practice

A seminar runs from the time on the left clock (morning) to the time on the right clock (afternoon). The hour hand is 4.2 cm long. What area does the hour hand sweep during the seminar? (Take $π = \frac{22}{7} .$ )