# Bullseye #0B (Basic)

## Creator

Terrence O’Leary (A student)

## Difficulty

Basic

## On to the Challenge!

Can you create the following graph using desmos.com or some other graphing tool? If you’re victorious, leave us a note in the comments when you’re done.

Terrence made this great Desmos Sketch!

This is what I got:

x^2+y^2=1

x^2+y^2=4

x^2+y^2=9

x^2+y^2=16

x^2+y^2=25

x^2+y^2=36

x^2+y^2=49

x^2+y^2=64

x^2+y^2=81

I couldn’t figure out how to shade the circles, however. I spent a long time pressing every button I could to try to figure it out and came back unsuccessful.

Great! All you have to do to shade is to change the = sign to a <= sign!

x^2+y^2<1

x^2+y^2<4

x^2+y^2<9

x^2+y^2<16

x^2+y^2<25

x^2+y^2<36

x^2+y^2<49

x^2+y^2<64

x^2+y^2<81

mine: https://www.desmos.com/calculator/wvewcabdee

x^2+y^2<1

x^2+y^2<4

x^2+y^2<9

x^2+y^2<16

x^2+y^2<25

x^2+y^2<36

x^2+y^2<49

x^2+y^2<64

x^2+y^2<81

x^2+y^2<1

x^2+y^2<4

x^2+y^2<9

x^2+y^2<16

x^2+y^2<25

x^2+y^2<36

x^2+y^2<49

x^2+y^2<64

x^2+y^2<81

This is what I came up with:

x^2+y^2<=1

x^2+y^2<=4

x^2+y^2<=9

x^2+y^2<=16

x^2+y^2<=25

x^2+y^2<=36

x^2+y^2<=49

x^2+y^2<=64

x^2+y^2<=81