# Are all circles ellipses?

**Circles**Are

**Ellipses**. It is possible to construct an

**ellipse**that appears to be a

**circle**. But an

**ellipse**possesses a distinct ontology, a second focus, that no

**circle**can possess. A

**circle**is just an

**ellipse**in which the two foci coincide.

Considering this, is Circle A ellipse?

In fact a **Circle** is an **Ellipse**, where both foci are at the same point (the center). In other words, a **circle** is a "special case" of an **ellipse**. **Ellipses** Rule!

**difference between**the

**circle**and the

**ellipse**is that

**in an ellipse**, there are two radius measures, one horizontally along the x-axis, the other vertically along the y-axis. Clearly, for a

**circle**both these have the same value. By convention, the y radius is usually called b and the x radius is called a.

Beside this, are all circles ovals?

6 Answers. **Circles** and **ovals** are both types of ellipses. An '**oval**' is really the informal term for an 'ellipse', whereas a '**circle**' is an ellipse where the semi-major and semi-minor axes are equal. If you're talking about higher-dimensions, the word you are looking for is probably ellipsoid.

Dividing both sides by r2 yields x2r2+k2y2r2=1, an **ellipse** in standard form. Thus transformation from a **circle** to an **ellipse** is scaling x−x0 and y−y0. HINT. -Any **circle** is in bijective correspondence (actually is homeomorphic) with all **ellipse** having the same center (and a lot of others **ellipses**).