# Math Help - Angles and degrees question

1. ## Angles and degrees question

Hello everyone,

I'm busy studying for the SAT & have ran into a problem that I do not quite remember in Geometry from my freshman year. I know it's an easy one to solve, but I can't figure out where to start. Can I have a little guidance on this? :

Regards,
Lance

2. ## Re: Angles and degrees question

Originally Posted by Nepenthes
Hello everyone,

I'm busy studying for the SAT & have ran into a problem that I do not quite remember in Geometry from my freshman year. I know it's an easy one to solve, but I can't figure out where to start. Can I have a little guidance on this? :
...
I've modified your sketch a little bit. The numbers in red are : 180°

Determine the value of a;
afterwards use the property that
$b = (a+10)^\circ$