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The hour hand of a clock completes one full circle every 12 hours. Therefore, in a 24-hour day, the hour hand covers a full circle twice. This is because the hour hand completes one full rotation from 12 o'clock to 12 o'clock in the morning and another full rotation from 12 o'clock to 12 o'clock at night.
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What is the difference between circumference of circle and area of circle?
the circumference is pi times the diameter. the area is pi times radius-squared. And, of course, the Circumference is the distance around the circle, or the outside. While on the other hand, the area of a circle is the amount of space on the inside of a circle:) hope this helps !
How many degrees does the second hand on a clock travel when it moves through one second?
6 degrees. There are 360 degrees in a full circle, and therefore for every second the hand moves through one sixtieth of a circle.
How many degress does the minute hand move every second.Explain?
It moves 0.1 degrees per second. There are 360 degrees in a full circle - so, every minute that passes, the hand moves six degrees. Thus, every second, the hand moves one tenth of a degree (6 degrees divided by 60).
What are clocks that are not digital called?
Analog clocks have an hour hand and minute hand, and 12 numbers around a circle.
Why is the formula for circle's area pi times r squared?
Here is one way of approaching this formula.We need to know two things:* the area of a triangle is half the base times the altitude; * the circumference of a circle is 2 pi r. Draw a circle and inscribe a hexagon inside the circle. Then draw the radii from the centre of the circle to each of the six vertices of the hexagon. (Sorry, I don't have a diagram.)The hexagon has been divided into six triangles. Look at one of these triangles: it has base one side of the hexagon and altitude a bit less than the radius of the circle.The area of all six triangles is6 times (1/2) times (side of hexagon) times (altitude of triangle).Shuffle this slightly to get(1/2) times 6 times (side of hexagon) times (altitude of triangle).Now 6 times (side of hexagon) is the perimeter of the hexagon. Soarea of hexagon = (1/2) times (perimeter of hexagon) times (altitude of triangle).Do this again with a 12-sided figure instead of a hexagon, then a 24-sided figure, and so on. We getarea = (1/2) times (perimeter of many-sided figure) times (altitude of triangle).If we take a figure with a lot of sides, its area will be very close to that of the whole circle, its perimeter will be very close to the circumference of the circle, and the altitude of one of the (very thin) triangles will be very close to the radius.So (waving my hands a bit here),area of circle = (1/2) times (perimeter of circle) times (radius of circle).If we know that the perimeter of the circle is 2 pi r, we getarea of circle = (1/2) time 2 time pi times r times r = pi times r squared.This isn't quite a precise proof, because of the hand-waving bit. But it could be made into one. See Archimedes' proof in http://en.wikipedia.org/wiki/Area_of_a_disk.
