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Let us say that you are going to paint a large circle onto the floor of your gymnasium (you are painting not just the circumference, but the whole circle) and you need to find out how much paint you need to buy. You know how many square feet will be covered by a gallon of paint and you therefore need to know the surface area of the circle. There is convenient formula for the area of a circle, which is area equals pi time the radius squared (pi is approximately 3.14). So if you measure the radius of the circle, you can figure out how much paint you need.
There are also innumerable other situations in which it is useful to know the radius of a circle.
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SteveKnowing the radius of a circle is important because it helps in calculating various properties of the circle, such as its circumference, area, diameter, and also determining the length of an arc or the position of points on the circle. The radius is a fundamental measurement that allows for the understanding and analysis of the circle's geometric properties.
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How do you find the radius of a circle if you know the radius?
You already know the radius.
Can the cumference of a circle be found?
Yes. you need to know the diameter or radius of the circle and then the formula is:- Circumference = Pi*Diameter or Circumference = 2Pi*Radius. An approximate value for Pi is 3.14159.
How do you find circumference of a circle the easy way?
You need to know the radius first. Next you simply double the radius to get the diameter and then multiply that by pie and you have now worked out the circumference of your circle :)
How do you find the radius of the base in a cylinder?
It depends on the values you have. The base of a cylinder is a circle. If you know the circle's diameter, half it to find the radius. If you know the circle's circumference, divide by 2pi to find the radius. If you know the circle's area, divide by pi and take the square root to find the radius.
How do you find the centre of a circle given part of a radius?
You would have to know the length of the radius. The center of the circle is at one end of the radius. If you just know where some part of the radius is, and not that the part touches the circle then you cannot know where the center is without at lest a point on the circumference.
