# Thread: how to find a number in Circle of Triangle picture Q3

1. ## how to find a number in Circle of Triangle picture Q3

Can you help to find a number in Circle of Triangle on Q3 of the picture

2. ## Re: how to find a number in Circle of Triangle picture Q3

For 3 (a) ... (see diagram). I labeled the corner values $a$, $b$, and $c$. Set up three equations.

$a+b=-1$

$b+c=-6$

$a+c=-9$

Solve the system of equations ... you should get $a=-2$, $b=1$, and $c=-7$

3. ## Re: how to find a number in Circle of Triangle picture Q3

many thanks to Skeeter