**circle**:

So if a full moon looks like a circle, how would describe the shape of a crescent moon? Sure, it's a "crescent," but let's try to be more specific. Throughout each month, the shape of the moon changes, but the shape actually follows a specific mathematical pattern.

Here are sketches of three different "crescents," but only one of these is an accurate sketch of a crescent moon as it might appear in the sky. Which one of these do you think the moon could look like?

**Leave your vote in the comments below, and we'll reveal the correct answer in a later post!**

Here's a little more background on the three sketches: each one starts with a circle, and then part of the circle is removed. In each sketch, the shape of the removed piece is another

**conic section**. Conic sections are

**a group of mathematical functions including**

**circles**,

**ellipses**,

**parabolas**, and

**hyperbolas**.

In sketch A, an

**ellipse**was removed, producing two crescents (as shown in the image below). Perhaps the moon could look like one of these crescents...

**circle**of equal radius was removed (as shown below). Perhaps the moon looks like

*this*crescent...

In sketch C, a

**parabola**was drawn inside the circle, and everything to the right of the parabola was removed. Does the moon look like*this*crescent?
Again, vote below!

Hi,

ReplyDeleteI had a look to moon images on Google and I think it's B.

Yours

Jack

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