Today's class for 9B

Today we continued the lesson we were learning yesterday, because we didn't finish it. This was about arcs and angles.



We learned some definitions of types of circles and arcs:

Concentric circles: circles (two or more) that have the same center.








Congruent circles: circles with the same radius, and therefore have the same diameter, and so have the same circumference.



Similar circles: All circles are similar, in the same way that all squares are similar, and all equilateral triangles are similar (although circles aren't poligons).



Congruent arcs: Arcs that have the same length (but not the same measure! To find length, you have to use the formula we learned in the previous class).



Then we went to the computer lab to see and try to correct a mistake that someone in the other class had made in the blog post. After noticing and the mistake and correcting it, we went back to the classroom to do the homework assigned.



* Homework is on page 456, #19-51 ALL. *