05/05/2009

Todays calss we started reviewing the quiz and the we started with learning about solids,

there are 4 types of solids; the Polyhedral/Polyhedrons, Cone, Cylinder and Sphere.

The Polyhedral/ Polyherdons are divided in two sections the Prisms and the Pyramids and those in other two regular and irregular.
Prism:
It's a solid with:

• 2 congruent and parallel bases
• the lateral faces are rectangles or parallelograms
• a prism is regular when the bases are right on top of each other and the lateral faces are rectangles, their bases are also regular polygons.
• a prism is oblique when the bases aren't right on top of each other and the lateral faces are parallelograms.

Pyramid:
It's a solid with:

• only 1 base
• the lateral faces are triangles
• a pyramid is right when the vertex and the center of the base are in top of each other.
• in an olique pyramid don't

Cone:
It's a solid with one cirular base and a vertex.

Cylinder:
It's a solid with two circular bases.