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Clock Geometry. Half Past Quarter Past Quarter Till. How many hours does one revolution of the minute hand around the face of a clock represent?. How many hours does one revolution of the minute hand around the face of a clock represent?. 1.

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Clock Geometry

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Clock geometry

Clock

Geometry


Clock geometry

Half Past

Quarter Past

Quarter Till


Clock geometry

How many hours does one revolution of the minute hand around the face of a clock represent?


Clock geometry

How many hours does one revolution of the minute hand around the face of a clock represent?

1


Clock geometry

How many minutes does one revolution of the minute hand around the face of a clock represent?


Clock geometry

How many minutes does one revolution of the minute hand around the face of a clock represent?

60


Clock geometry

If there are 12 numbers on a clock, how many minutes are there between 2 consecutive numbers?


Clock geometry

If there are 12 numbers on a clock, how many minutes are there between 2 consecutive numbers?

60 ÷12=5


Clock geometry

How many minutes are there between the numbers 12 and 6?


Clock geometry

How many minutes are there between the numbers 12 and 6?

5x6=30


Clock geometry

30 is what part of 60?


Clock geometry

30 is what part of 60?

One half


Clock geometry

How is another way to express the time 12:30?


Clock geometry

How is another way to express the time 12:30?

Half past twelve


Clock geometry

How many minutes are there between the numbers 12 and 3?


Clock geometry

How many minutes are there between the numbers 12 and 3?

5x3=15


Clock geometry

15 is what part of 60?


Clock geometry

15 is what part of 60?

One quarter


Clock geometry

How is another way to express the time 12:15?


Clock geometry

How is another way to express the time 12:15?

Quarter past twelve


Clock geometry

How many minutes are there between the numbers 9 and 12?


Clock geometry

How many minutes are there between the numbers 9 and 12?

5x3=15


Clock geometry

15 is what part of 60?


Clock geometry

15 is what part of 60?

One quarter


Clock geometry

How is another way to express the time 12:45?


Clock geometry

How is another way to express the time 12:45?

Quarter till one


Clock geometry

The Clock as

A Geometric

Figure


Clock geometry

What geometric figure does the face of this clock represent?


Clock geometry

What geometric figure does the face of this clock represent?

A circle


Clock geometry

How many degrees are there in a circle?


Clock geometry

How many degrees are there in a circle?

360°


Clock geometry

How many minutes are there in one revolution of the minute hand?


Clock geometry

How many minutes are there in one revolution of the minute hand?

60


Clock geometry

If a clock can be seen as a circle, how many degrees does each minute represent?


Clock geometry

If a clock can be seen as a circle, how many degrees does each minute represent?

360°÷60=6°


Clock geometry

How many minutes are there between the numbers 12 and 1 on a clock?


Clock geometry

How many minutes are there between the numbers 12 and 1 on a clock?

5


Clock geometry

How many degrees are there between the numbers 12 and 1 on a clock?


Clock geometry

How many degrees are there between the numbers 12 and 1 on a clock?

6°x5=30°


Clock geometry

How many minutes are there between the numbers 12 and 3 on a clock?


Clock geometry

How many minutes are there between the numbers 12 and 3 on a clock?

15


Clock geometry

How many degrees are there between the numbers 12 and 3 on a clock?


Clock geometry

How many degrees are there between the numbers 12 and 3 on a clock?

6°x15=90°


Clock geometry

If we draw a line from the center of the clock to the number 12, another line from the number 12 to the number 3, and a third line from the number 3 back to the center of the clock, what geometric figure do we have?


Clock geometry

If we draw a line from the center of the clock to the number 12, another line from the number 12 to the number 3, and a third line from the number 3 back to the center of the clock, what geometric figure do we have?

A triangle


Clock geometry

If there are 90° between the number 12 and the number 3, how many degrees are there in the angle at the center of the circle?


Clock geometry

If there are 90° between the number 12 and the number 3, how many degrees are there in the angle at the center of the circle?

90°


Clock geometry

Can this triangle be called a right triangle?


Clock geometry

Can this triangle be called a right triangle?

Yes, a right triangle is a triangle with one 90° angle.


Clock geometry

If the three angles of a triangle add up to 180°, and the angle at the center of the circle is 90°, and the other two angles are equal, how many degrees are in each?


Clock geometry

If the three angles of a triangle add up to 180°, and the angle at the center of the circle is 90°, and the other two angles are equal, how many degrees are in each?

180°-90°= 90°

90°÷2=45°


Clock geometry

Is the distance between the center of a circle and any point on its circumference equal?


Clock geometry

Is the distance between the center of a circle and any point on its circumference equal?

yes


Clock geometry

Can this triangle be called an isosceles triangle?


Clock geometry

Can this triangle be called an isosceles triangle?

Yes, an isosceles triangle is a triangle with two equal sides and two equal angles.


Clock geometry

How many degrees are there between the numbers 5 and 7 on a clock?


Clock geometry

How many degrees are there between the numbers 5 and 7 on a clock?

6°x10=60°


Clock geometry

If we draw a line from the center of the clock to the number 5, another line from the number 5 to the number 7, and a third line from the number 7 back to the center of the clock, what geometric figure do we have?


Clock geometry

If we draw a line from the center of the clock to the number 5, another line from the number 5 to the number 7, and a third line from the number 7 back to the center of the clock, what geometric figure do we have?

A triangle


Clock geometry

If there are 60° between the number 5 and the number 7, how many degrees are there in the angle at the center of the circle?


Clock geometry

If there are 60° between the number 5 and the number 7, how many degrees are there in the angle at the center of the circle?

60°


Clock geometry

If the three angles of a triangle add up to 180°, and the angle at the center of the circle is 60°, and the other two angles are equal, how many degrees are in each?


Clock geometry

If the three angles of a triangle add up to 180°, and the angle at the center of the circle is 60°, and the other two angles are equal, how many degrees are in each?

180°-60°= 120°

120°÷2=60°


Clock geometry

Can this triangle be called an equilateral triangle?


Clock geometry

Can this triangle be called an equilateral triangle?

Yes, a triangle with three 60° angles is an equilateral triangle.


Clock geometry

Review


Clock geometry

An hour has 60 minutes.

15 minutes make a quarter hour.

For 15 minutes after an hour we can say quarter past the hour.


Clock geometry

4. For 45 minutes after an hour we can say quarter till the next hour.

5. For 30 minutes after an hour we can say half past the hour.


Clock geometry

6. A circle has 360°.

7. Each minute on a clock represents 6° on the circumference of a circle.

8. A triangle has three sides.


Clock geometry

9. A right triangle has one 90° angle.

10. An isosceles triangle has two equal sides and two equal angles.


Clock geometry

11. An equilateral triangle has three equal sides and three 60° angles.

12. Geometry is everywhere. Just look for it!


Clock geometry

Prepared by

Robert Janak

Beaumont,

Texas


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