A little R in a circle usually means "registered trademark".
An annulus. Area = pi (R2 - r2) when R is radius of larger circle and r is radius of smaller circle.
The area of a circle is the number of square units inside that circle, if each square in the circle to the left has an area of 1cm2, you could count the total number of squares to get the area of this circle. However, it is easier to use one the following formulas; A=.r²or A=pi times r times r, where A is the area and r is the radius.
You are describing a railroad crossing sign.
The director circle of a circle with radius r is a concentric circle with radius r*sqrt(2).
A little R in a circle usually means "registered trademark".
An annulus. Area = pi (R2 - r2) when R is radius of larger circle and r is radius of smaller circle.
It is r*sqrt(2) = 1.414*r, approx.
stronger?
R = radius of big circle, r = radius of little circle Area of circle = pi x R x R = 4 x pi x r x r = 4 x pi x 3 x 3 Therefore R x R = 36 and so R = 6 inches
The radius of the circle decreases when you make the circle smaller.
The area of a circle is the number of square units inside that circle, if each square in the circle to the left has an area of 1cm2, you could count the total number of squares to get the area of this circle. However, it is easier to use one the following formulas; A=.r²or A=pi times r times r, where A is the area and r is the radius.
You are describing a railroad crossing sign.
stronger. easy.
3.14 x (r x r) 9 foot diameter circle
The 'r' means the radius, exactly half of the diameter. Find the centrepoint of the circle, then draw a line from the centre to the outside. This line is your radius.
Consider a circle of radius r. You want a square inside of that circle. The diameter of the circle is 2r and this is also the length of the diagonal of the square. Now the Pythagorean theorem says that if the side of the square inside the circle is of length s. 2s2 =4r2 this come for a2 +b2 =c2 where a and b are s and c is 2r so we have s2 =2r2 Then length of the side OS the square is r(square root of 2) or s=r(square root of 2)