Class of May 8, 2009 :D

iushaiuhsaiuhYesterday we started class by learning new subject instead of correcting homework.

We learned the formulas for fiding lateral and surface areas of right cylinders, just as we had done for right prisms on thursday.
SOOO:

The formula for the Lateral Area is L=(p)(h), L being lateral area (!), p being perimeter of the base (or the crcumference of the base/circle) and h being the height of the CYLINDER.

The formula for Total Surface Area is T=L+2B, T being total surface area, L being the lateral area and B being the area of the base. Just a reminder: the formula for the base of the cylnder (or for the area of a circle) is A=πr².

After, we corrected our homeworks. Something that gave me a hard time was finding the perimeter of the solid, which was required to do like... 99% of the hw... So, teh perimeter of the solid is the same as the perimeter of ONE BASE.
>>>Exercise 25 gave a hard time to something like.. ahn.. all of us (except one or two). The thing is you cannot divide the shape into two and find the total surface areas of both and add - cause then, you'll add the area of the part they connect, which is not filled. Sooo, you have to find the area of everything: divide the solid into polygons and fint the areas of these.

And that was the class... In the end:
HOMEWORK!! \o/
Page 596 #s 26-30 all + 32-34 all
It's a good idea for those who didn't do the last hw (pg 596 #s15-25 all + 32 + 33) to do it, because Ms. Saatkamp said she was not going to explain the exercises for us if we don't do it... So, PLEASE, DO IT!)

;*