Antarctic
Antarctic Circle

Arctic
Arctic Circle

circle
upper circle

division
division of a circle

dress
dress circle

escribed
escribed circle

great
great circle

half-circle
semicírculo

hut
hut circle

inscribed
.../ inscribed circle / inscribed polygon

perfect
a perfect circle

pitch
pitch circle

quadrature
quadrature of the circle

radius
radius of a circle

root
root circle

sailing
great circle sailing

sector
sector of circle

small
small circle

square
to square the circle

squaring
squaring the circle

stone
stone circle

swing around
to swing round the circle

swing round
to swing round the circle

traffic
traffic circle

vicious
vicious circle