# Equation for an arc

• September 29th 2009, 07:30 AM
mateoc15
Equation for an arc
I need some help with the equation of an arc. I want it to be part of a perfect circular arc (not oval, etc) in the +/+ quadrant. It should start at 0, 10 and go down to 10, 0. Can someone help me out with the equation for that? Should look like the top right quarter of a circle centered around 0, 0 point. I'm a bit stuck. Really I want to put this into an Excel graph but figure I'll just use the equation to create 10 points and graph it based on that.

Thanks!
• September 29th 2009, 08:02 AM
Soroban
Hello, mateoc15!

You have a circle, centered at (0,0) with radius 10.

Its equation is: . $x^2 + y^2 \:=\:10^2$

For the quarter-circle in Quadrant 1: . $y \:=\:\sqrt{100-x^2}\;\text{ for }\, 0 \leq x \leq 10$

• September 29th 2009, 08:06 AM
mateoc15
Perfect! Thanks!