## Sunday, February 5, 2012

### Rolling into the First Full Week of February

Here we are again, ready to start another week of school!  In math, we will be starting an in-depth discussion about circles.  Some of what we talk about will be a review from previous year's work, but it is important that we are comfortable manipulating circles so that some work we do with surface area in the near future will be easier.  Here is come circle information taken from math2.org:

 arc: a curved line that is part of the circumference of a circle chord: a line segment within a circle that touches 2 points on the circle. circumference: the distance around the circle. diameter: the longest distance from one end of a circle to the other. origin: the center of the circle pi (): A number, 3.141592..., equal to (the circumference) / (the diameter) of any circle. radius: distance from center of circle to any point on it. sector: is like a slice of pie (a circle wedge). tangent of circle: a line perpendicular to the radius that touches ONLY one point on the circle.
diameter = 2 x radius of circle

Circumference of Circle = PI x diameter = 2 PI x radius
where
PI =  = 3.141592...

Area of Circle:
area = PI r2

In science, we will finish up our research essays about biomes.  I am so excited to begin reading you essays and learn all the great facts you've discovered!  Remember to use the cover sheet rubric to be sure you've included all the requirements for the assignment.  The essay will be due this Friday.  Friday will also be the day we have our test on climate zones and biomes.  We will create a study booklet on Monday to help you prepare.  You will also need to review the notes I gave you last Monday.  You can find it in THIS blog post.

Happy Super Bowl Sunday!
Mr. Trent