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What is a circle with a little circle in it called?
An annulus. Area = pi (R2 - r2) when R is radius of larger circle and r is radius of smaller circle.
What is the length of half a circle called?
The length of half a circle is called a semicircle. It represents half of the circumference of a full circle. The formula for the circumference of a circle is (C = 2\pi r), so the length of a semicircle would be (\pi r), where (r) is the radius of the circle.
One fourth of a circle is called a?
It should be called the fourth of a circle. Numerically, it's (2pi x r)/4 for the perimeter. and (pi x r squared) / 4 for the area.
What is the name of the line around a circle?
The line around a circle is called the circumference. It is the distance measured along the outer edge of the circle. The circumference is calculated using the formula ( C = 2\pi r ), where ( r ) is the radius of the circle.
What do you call the perimeter of a circle?
The perimeter of a circle is called the circumference and the formular of finding it is Pi D or 2Pi R
How do you find the director circle of circle?
The director circle of a circle with radius r is a concentric circle with radius r*sqrt(2).
What happens to the area of a circle when the radius is tripled?
The area of the circle becomes 9 times the area of the original circle. Original circle = Pi * (r ^ 2) = Pi * r * r New Circle = Pi * ((3 * r) ^ 2) = Pi * 9 * r * r
What is half of a diameter of a circle called?
One half the diameter = the radius Algebraically expressed as d/2 = r or d = 2r
What is the approximate circumference of circle r?
Circumference of a circle with radius 'r' = 2(PI)(r) ~ 6.28(r)
If the radius of a circle is r what is the diameter of the circle?
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
What does r in the circle mean?
R = Radius The radius is half the diameter of a circle.
Help with math how do you get the area of a circle?
Area of a circle is calculated by A=2*p*r where A represents the circle's area and r is the radius of the circle.
