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Wednesday, November 23, 2005

Blogging for the Test!

We had just finished our fifth unit, which was Geometry! When we started the unit, we learned the volume and surface area of a sphere, which are: V: 4/3 (pi)radius ^3 and the surface area is: S.A: 4(pi)radius^2
and then we learned if the volume or the surface area increased how do we apply these rules. For example if I triple the radius of a sphere, what will happen to S.A or V?
and the answer is the volume will increase by 3 square which is 27 and the surface area will increase by 9.
We learned about scale factor and how it works.
" The impact of 'scale factor' on lengths, areas and volumes." A scale factor is a multiplier.
Areas are multiplied by the square of the scale factor. (we multiply the area by the scale factor square)
Volumes are multiplied by the cube of the scale factor. ( multiply the volume by the scale factor cube)
after this we learned a lot about Quadrilaterials.
quadrilaterial: any 4 sides figure. they come in two basic flavours ;)
Convex Quadrilaterial and Concave or Dart. (i was going to draw it but i couldn't)
And the types of quadrilaterial:
Trapezoids: Trapezoid, Right Trapezoid, Isosceles Trapezoid
Rectangle, Rhombus, Square
and at last we learned the special qualities and more stuff about them.
and this was our unit!
I hope everyone will get a good mark!

P. A


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