half a circle is a semicircle half a ball is a hemisphere does that help?
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Picture the center of a circle. The distance from it to the edge of the circle is the radius. The fixed distance from the center to the edge of any part of the circle is radial movement. So radial movement is the circular distance an object can move from a fixed point.
A circumscribed polygon is a polygon all of whose vertices are on the circumference of a circle. The circle is called the circumscribing circle and the radius of the circle is the circumradius of the polygon.
If you're talking about the thinnest layer of the atmosphere, then it is the EXOSPHERE..
A buttonhole will need to be as wide as the widest part of the button, if the button is to be able to pass through it. A button is a circle shape; the widest part of a circle is its diameter. The formula to find the circumference of a circle is Pi multiplied by the diameter of a circle. We already know the circumference of the button, and we know the value of Pi, so we can rearrange the above formula: 3.14 x diameter = 7.38 ---> 7.38 / 3.14 = diameter So, the diameter of the button is 2.35 cm. The buttonhole will therefore need to be this size. Actually, probably a tiny bit bigger unless you want it to be extremely tight!
gravity keeps us in a circle