Multiple choice

How many right angles does the hour hand of a clock turn when it moves from 12 to 9?

  1. 1

  2. 2

  3. 3

  4. 4

  5. NA
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C Correct answer
Explanation

The hour hand moves from 12 to 9, covering 3/4 of the clock face. 3/4 of 360 degrees is 270 degrees. Since one right angle is 90 degrees, 270/90 = 3.

AI explanation

A clock face is a complete circle divided into 12 hours, meaning each hour represents a 30 degree rotation. Moving from 12 to 9 covers a total of 9 hours, which is an angular rotation of 9 times 30 degrees, equaling 270 degrees. Since a right angle measures 90 degrees, the hour hand turns through 270 divided by 3 right angles, resulting in 3 right angles.

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