Wait a second. I need to tell Kira what time I'll get to the playground. Well one of my other friends goes left and it takes him 10 minutes. And to walk the whole slant of the triangular road takes 20 minutes. The park is on the corner of the slanted path.
Oh I know! I'll use the pythagorean theorem Coach Moody taught me. Oh, what was it again? Oh yeah...
a2+b2 = c2
(Addressing a student) is there something you need to share with the class?