シリウスを回る軌道は楕円形である。の英語

The orbit around Sirius is elliptical.

The orbit of a planet is elliptical in shape.

a circle is an ellipse with zero eccentricity

a shape that is generated by rotating an ellipse around one of its axes

The opposite sides of a square are parallel.

The opposite sides of a parallelogram are parallel.

a radius which passes through focus of ellipse

one-half the major axis of an ellipse

a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle

A parallelogram is a quadrilateral formed from two sets of parallel lines.

The opposite sides of a rectangle are parallel.

a large pictorial representation encircling the spectator, called cyclorama

an elliptic orbit

the area enclosed by two perpendicular radii of a circle

The shape of a box is usually square.

The flange isn't at the correct angle.

A square has four sides.

an oval astronomical orbit

having columniation completely circling an area of the structure

a pattern that is formed by a series of continuing hexagonal shapes

ellipse in which the two axes are of equal length

an epicycloid in which the rolling circle equals the fixed circle

a cycloid generated by a point outside the rolling circle

There are gaps and spirals in the disks.

concentric circles are parallel

a line generated by a point on a circle that rolls around inside another circle

a revolving ellipsoid called an earth ellipsoid

a cycloid generated by a point inside the rolling circle

A right triangle has a 90 degree corner.

the length of the circumference of a circular object