1. Measurement of quater circle

Hello all, im a n00b, go easy on me.

1st I hope I have this in the correct forum, please move if not

I am designing a lightbox, so I can take some pretty cool photographs, and I want to design it properly first, general maths is ok, but when it comes to calculating the length of the circumference of circles i am stumped.

See my diagram, my light box is to have a quater circle curve, of 10cm radius. What I need to know, is how long the circumference of that quater circle is.

I can then do the rest of the calculations to determin the back wall and the floor.

Many many thanks.
ILMV aka Ben

2. The circumference of a circle is not a complicated formula. Easy to learn.

It's $2{\pi}r$. In your case, r=10, so you have a circumference of $20{\pi}=62.83$

Now a quarter circle is 1/4th this. $\frac{20{\pi}}{4}=5{\pi}=15.71$

3. Many Thanks

Just what I needed, I wil bookmark this for future reference.