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Draw a line that passes through the center of the circle (if the center is not marked, you can still find it by various means of geometrical construction, if you have a compass, or by slowly pulling a ruler down through the circle and seeing where the measurement of the circle is largest). The line that passes through the center, going from one side of the circumference to the other, is the diameter. The radius is simply half the diameter and can be measured directly, with a ruler. Once you have that figure, you can calculate the circumference. The circumference is equal to pi times the diameter, or two pi times the radius. Pi is equal to approximately 3.1415 which is close enough for all usual purposes.
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoThe Radius is one-half of the diameter. The formula is R = D/2 The Circumference is the distance around a circle. The formula is C = Pi x D (Pi = 3.1416 and D is the diameter)
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How do i find circumference and area of a circle?
Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared
How do you find the circumference of a circle with a radius of 4?
Circumference of a circle = 2*pi*radius = 8*pi or 25.13274123 units
When you know the circumference of a circle how do you find the diameter?
If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
How do you find radius of circle?
Measure the distance from the centre of the circle to its circumference.
What is the radius and the area of a circle?
The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.
How do you find the radius of a circle with the circumference in terms of pi?
find the radius of a circle with circumference of 42.1
How do you find circumference of a circle if you have radius?
For a circle, circumference = 2 x pi x radius.
What is the circumference of a circle with a radius of In?
A circle with a radius of 8 inches has a circumference of 50.27 inches.
How do you find circumference using radius'?
Circumference of a circle = 2*pi*radius
How do you find the radious of a circle can you find the circumference?
The radius of a circle is the distance from its centre to its circumference. If a circle has a radius of r units then the length of its circumference is 2*pi*r units.
How do find the circumference of a circle?
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
Find the circumference of a circle with a radius of 5.6?
Circumference of a circle = 2*pi*radius Circumference = 2*pi*5.6 = 35.18583772 units
How can you find the circumference of circle?
Circumference of a circle = 2*pi*radius or diameter*pi
What is the radius of a circle if the circumference is 232.4 inches?
To find the radius of a circle, divide the circumference by 2π (approximately 6.28). Therefore, the radius of the circle with a circumference of 232.4 inches is 36.9 inches (232.4 / 6.28).
How do i find circumference and area of a circle?
Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared
How do you find the circumference of a circle with a radius of 4?
Circumference of a circle = 2*pi*radius = 8*pi or 25.13274123 units
The radius of a circle is 5 inches Find the circumference of the circle?
Circumference = 2 x pi x radius = 31.4159
