[Guest]

In celebration of my tenth riddle on the Den, I have taken a five day vacation to think of a nice hard one.

jk, jk... I only spent today on it, but I did take the vacation.

Anyway, here's a nice hard one (i hope...i thought my last one was pretty good )

Now for the riddle, here you go:

The chords that are played by me...

Hard you say? Try it! It's a piece of cake!

What's that? You don't like cake?

Okay then, how about a doughnut? Or a piece of pie?

Okay, whatever, back to me.

About me are hundreds of inscriptions

On my walls those writings are visible

See more than one? Well, a genius like you

could take one glance and tell me all about me

But that's not what I'm asking

What do I have to do with?

Well, radiation...a little...

Ditto for arcades

Now, a question for you...

What am I?

[Guest]

ok now to turn on the thinking cap

[Guest]

circle.

There's chords in a circle, doughnuts and cakes are circular, there's some radiation, all that stuff

[Guest]

circle.

There's chords in a circle, doughnuts and cakes are circular, there's some radiation, all that stuff

that's it! good thinking

here's more explaining:

The chords that are played by me...--yes, there are chords in circles

Hard you say? Try it! It's a piece of cake!--that's actually just to divert you from the next hint

...or a piece of pie...anyway--a pun: pie--pi (the greek letter), has to do with circles, right?

About me are hundreds of inscriptions--inscribed angles

On my walls those writings are visible--the rays lie on the circle

See more than one? Well then, there are many

who could take one glance at those markings

and tell me all about me--there are theorems and such that allow you to tell the measures of angles, etc etc

But that's not what I'm asking you to do

What do I have to do with?

Well, radiation...a little...--radiation: radius

Ditto for arcades--arcades: arc

Now, a question for you...

What am I?--jippiidan and divinerebel have the answer

good job, i thought this one would go farther than Ebony and Ivory (#6)

[Guest]

that's it! good thinking

here's more explaining:

The chords that are played by me...--yes, there are chords in circles

Hard you say? Try it! It's a piece of cake!--that's actually just to divert you from the next hint

...or a piece of pie...anyway--a pun: pie--pi (the greek letter), has to do with circles, right?

About me are hundreds of inscriptions--inscribed angles

On my walls those writings are visible--the rays lie on the circle

See more than one? Well then, there are many

who could take one glance at those markings

and tell me all about me--there are theorems and such that allow you to tell the measures of angles, etc etc

But that's not what I'm asking you to do

What do I have to do with?

Well, radiation...a little...--radiation: radius

Ditto for arcades--arcades: arc

Now, a question for you...

What am I?--jippiidan and divinerebel have the answer

good job, i thought this one would go farther than Ebony and Ivory (#6)

Aw, I didn't get back in time to "choose" an answer from my litany of guesses! Great puzzle!