Showing posts with label circle. Show all posts
Showing posts with label circle. Show all posts

Wednesday, January 19, 2011

11.1 and 11.2

Today in class we learned about the area of two dimensional shapes

Area: the number of square units of space within the boundary of a region

Here's a few formula's for area:

rectangle: A=bh

parallelogram: A=bh


area of a rectangle=area of a parallelogram


triangle: A=(1/2)bh

circle:


We also learned a little about these postulates:



-If two closed figures are congruent, then their areas are equal



-If two closed regions intersect along a common boundary, then the area of their union is equal to the sum of their individual areas


the area of the whole shape=the area of the square + the area of the triangle



And thats basically it!
-Olivia