Question
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Find the measure of the smaller angle formed by the hands of a clock at the following time. \( 1: 15 \) The angle is \( \square^{\circ} \square^{\prime} \). (Simplify your answers.)

Ask by Turnbull Burton. in the United States
Feb 03,2025

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Tutor-Verified Answer

Answer

The smaller angle between the clock hands at 1:15 is \(52^{\circ}\, 30′\).

Solution

To determine the smaller angle between the hour and minute hands at **1:15**, follow these steps: 1. **Minute Hand Position:** - Each minute represents **6°** (since \(360° \div 60 = 6°\)). - At **15 minutes**, the minute hand is at: \[ 15 \times 6° = 90° \] 2. **Hour Hand Position:** - Each hour represents **30°** (since \(360° \div 12 = 30°\)). - At **1:00**, the hour hand is at: \[ 1 \times 30° = 30° \] - Additionally, the hour hand moves **0.5° per minute** (since \(30° \div 60 = 0.5°\)). - In **15 minutes**, it moves: \[ 15 \times 0.5° = 7.5° \] - Therefore, at **1:15**, the hour hand is at: \[ 30° + 7.5° = 37.5° \] 3. **Calculating the Angle Between the Hands:** - The absolute difference between the minute and hour hands is: \[ |90° - 37.5°| = 52.5° \] - Converting **52.5°** to degrees and minutes: \[ 52° \, 30′ \] **Answer:** The angle is \(52^{\circ}\, 30′\).

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Beyond the Answer

To find the angle between the hour and minute hands of the clock at 1:15, we can use the following formula: 1. **Minute Hand**: The minute hand moves at \(6\) degrees per minute. At 15 minutes, it will be: \[ 15 \times 6 = 90^\circ \] 2. **Hour Hand**: The hour hand moves at \(30\) degrees per hour (since 360 degrees/12 hours = 30 degrees per hour) plus an additional \(0.5\) degrees for each minute (30 degrees/60 minutes = 0.5 degrees per minute). At 1:15, the hour hand will be: \[ 1 \times 30 + 15 \times 0.5 = 30 + 7.5 = 37.5^\circ \] 3. **Calculating the angle between the two hands**: \[ \text{Angle} = |90 - 37.5| = 52.5^\circ \] Thus, the measure of the smaller angle formed by the hands of the clock at 1:15 is \(52.5^\circ\).

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