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The sum of the angles swept by minute and hour hands in 54 minutes is324°327°347°351°

Question

The sum of the angles swept by minute and hour hands in 54 minutes is

  • 324°
  • 327°
  • 347°
  • 351°
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Solution

1. Break Down the Problem

To determine the sum of the angles swept by the minute and hour hands in 54 minutes, we must calculate the angle for each hand separately and then combine these values.

2. Relevant Concepts

  • The minute hand moves at a rate of 66^\circ per minute (since it completes 360360^\circ in 60 minutes).
  • The hour hand moves at a rate of 0.50.5^\circ per minute (since it completes 360360^\circ in 12 hours, or 720720 minutes).

3. Analysis and Detail

Step 1: Calculate the angle swept by the minute hand

Angle by minute hand=6×minutes \text{Angle by minute hand} = 6^\circ \times \text{minutes} Substituting 5454 minutes: Angle by minute hand=6×54=324 \text{Angle by minute hand} = 6^\circ \times 54 = 324^\circ

Step 2: Calculate the angle swept by the hour hand

The hour hand moves 0.50.5^\circ for every minute. For 54 minutes: Angle by hour hand=0.5×54=27 \text{Angle by hour hand} = 0.5^\circ \times 54 = 27^\circ

Step 3: Add the angles swept by both hands

Total angle=Angle by minute hand+Angle by hour hand \text{Total angle} = \text{Angle by minute hand} + \text{Angle by hour hand} Total angle=324+27=351 \text{Total angle} = 324^\circ + 27^\circ = 351^\circ

4. Verify and Summarize

The calculations for both angles have been verified, and their sum correctly represents the total angle swept by the hour and minute hands in 54 minutes.

Final Answer

The sum of the angles swept by the minute and hour hands in 54 minutes is 351351^\circ.

This problem has been solved

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