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Wednesday, November 23, 2005

Blogging for the Test!

Hello!
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
/
Parallelograms:
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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