Tuesday, September 16, 2014
Monday, September 15, 2014
Let's talk about perimeter. What do you notice about the perimeter of the big semicircle alone and all of the smaller ones together?
What will happen if we changed this so that all the small semicircles were really, really, really small. Wouldn't that essentially be a straight line?
Sunday, September 14, 2014
The man is walking down the sidewalk in the evening, at a constant speed. As he walks away from the streetlight, he casts a shadow in front of him.
If a second man were to try and keep up with the very front tip of his shadow, would he be walking at a constant speed, accelerating or decelerating, or what?
How do you know your answer is correct?
Saturday, September 13, 2014
Friday, September 12, 2014
Thursday, September 11, 2014
This is an actual SAT question, from later in a section so it is one that a lot of test-takers got wrong because it was a hard question, was worded strangely, had too many undefined letters, or was near the end of a section and the test-takers simply ran out of time.
What are some of the difficulties you think most students would have with it? What are some things we could do to rewrite the question so it's more clear?
Wednesday, September 10, 2014
Two opposite vertices of a square lie on a circle. Sure as sunrises, someone is going to ask about area.
What information do we need?
What would be the easiest scenario?
Is there more than one easy scenario?