A circumference
A circumference
It is called a radius
Assuming that primeter is your way of spelling perimeterand rectangel is your way of spelling rectangle, the answer is 22 metres.
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
A part of a circle between two points on a circle is called is called an arc.
you add up the sides of the figure.
The perimeter of the square is 40 inches.
Half a circle is called a semi-circle. Sometimes it is called a half-moon.
A squashed circle is called an elipse.
the interior of a circle is called a cabret