The radius can be used to calculate a circle's diameter, area and circumference. Likewise, a sphere's volume is calculated from the radius. If you already know any of these figures, you can easily ...

The diameter close diameter The distance across the circle, circumference to circumference, through its centre. of a circle is halved to give the radius. The value of π may be rounded to 3۰142 ...

The radius of the first circle is shown as 3cm. They then increase by 2cm each time: 5cm → 7cm → 9cm → 11cm. So, the radius of the largest circle is 11cm.

The vertical side of this rectangle is the radius of the circle and the length of the side is half of the circumference (so, 2πR). Yes, the area of this rectangle would be π R 2 . That's the ...

Every year, the celebration of Pi Day (March 14 is 3.14) grows more ambitious. Math teachers love to dream up unique classroom activities to celebrate Pi for it endless opportunity to calculate (3 ...