Question

through how many right angles does the minute hand move between 9 o'clock and 10:30 o'clock

Answer 1

total angle between 9 o' clock to 10:30 o' clock={(1 complete rotation+half rotation)}
= {360+180}°
= 720°
number of right angle ={total angle}/90°
= 720°/90°
= 8

Answer 2

6 Right angles are moved by minute hand  between 9 o'clock and 10:30 o'clock

Step-by-step explanation:

the minute hand move between 9 o'clock and 10:30 o'clock

Time = 10:30 - 9 = 1:30 hr

= 90 minutes

Minute Hand moves 360° every 60 minutes

=> minutes hand move in 1 minute = 360°/60 = 6°

minutes hand move in 90 minutes = 90 *  6° = 540°

right angle = 90°

Number of right angles moved =  540°/90° = 6

6 Right angles are moved by minute hand  between 9 o'clock and 10:30 o'clock

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