slope

day 32: Plan B

Lisa Bejarano 180 Days of Geometry 13-14, Geometry , ,

So today I planned a awesome geogebra activity discovering angle measures with parallel lines & transversals, then I found out that the set of laptops with geogebra installed was taken by another teacher.

It worked out well because students were still confused about slopes of parallel & perpendicular lines, so we played with that more instead.

I had a sub Friday. It is the last time I’ll ever get a sub who represents himself as doing math. I’d prefer a sub who has no recollection of math concepts so that they can build understand of an activity WITH students instead of yelling at them for not properly writing the slope formula, or just blurting out ” perpendicular lines have a negative reciprocal slope” right before they start an exploration discovery activity. ARGH