A circumference
A circumference
It is called a radius
A region of a circle called a pie slice is also called a sector. The sector is one of the main slices of a circle, the other is called a segment.
It's called a "chord" of the circle. If it happens to go through the center of the circle,then it's also called a "diameter" of the circle, and no other chord in the same circlecan be longer.
It may be called a 90 degree section , or 1 fourths of a circle.
Assuming that primeter is your way of spelling perimeterand rectangel is your way of spelling rectangle, the answer is 22 metres.
Is also called a segment.
half of the radius the radius is half of the diameter the diameter is the with of the circle. This also can be called a quadrent circle.
a hemisphere
If you're asking for the PRIINISTER its Rhodri Morgan
semicircleA half circle is called a semicircle.Half a circle is a semi-circle
That's a 'chord' of the circle.If it passes through the center of the circle, then it's also called a 'diameter'of the circle, and no other chord of that circle can be longer than it is.