When the hour is just on the clock face, the angle formed by the hour hand and the minute hand is acute, drawing two different whole hours.

The smaller angle formed by the hour hand and the minute hand at one o'clock and eleven o'clock is an acute angle.

The smaller angle between the hour hand and the minute hand at four o'clock and eight o'clock is an obtuse angle.

Extended data:

Conversion relationship of time units:

(1) One day = 1440 minutes, 1 hour =60 minutes, 1 minute =60 seconds.

(2) A moment = 15 minutes, and a word =5 minutes (used in southern Fujian and Guangdong).

Angle relation of each pointer of the clock:

(1) An ordinary clock is equivalent to a circle, and its hour hand or minute hand is equivalent to walking 360 degrees.

(2) The angle of each large grid on the clock is 30.

(3) Every time the hour hand passes 1 min, the corresponding angle should be 0. five

(4) The angle of minute hand per 1 min should be: 6.

Several key angles on the clock face:

Nine o'clock in the morning: the angle between the hour hand and the minute hand is 90 degrees.

Noon 12 o'clock: the angle between the hour hand and the minute hand is 0 degrees.

3 pm sharp: the angle between the hour hand and the minute hand is 90 degrees.

6 pm: The angle between the hour hand and the minute hand is 180 degrees.