Volume and Surface Area of Cone

Volume and Surface Area of Cone. Cone is a solid shape with an elliptical base and curved surface that tapers to a point (vertex). Vertex is where : two or more rays or the arms of an angle meet, the adjacent sides of a polygon meet or the edges of a solid figure meet. A cone has a flat base, It has one curved side, Because it has a curved surface it is not a polyhedron.

Surface Area
Surface Area of Base = π × r2, Surface Area of Side = π × r × s
Surface area of Cone = π × r2  + π × r × s

Volume = 

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Volume and Surface Area of Rectangular Cuboid

Volume and Surface Area of Rectangular Cuboid. In a rectangular cuboid (a polyhedron, a right prism with six rectangular plane faces ), all angles are right angles (a right angle is an internal angle which is equal to 90°), and opposite faces of a cuboid are equal ( having the same amount and value). It is also a right rectangular prism (a polyhedron, a prism with two identical, rectangular bases).  

Volume and Surface Area
The volume of a rectangular cuboid is found using the formula:
Volume = Height × Width × Length
Which is usually shortened to:
V = h × w × l
Or more simply:
V = hwl

Surface Area
And the surface area is found using the formula:
A = 2(wl + lh + hw)
    = 2((15x20)+(20x10)+(10x15)
    = 2(300 + 200 + 150)
    = 2(650)
    = 1.300 cm

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Volume and Surface Area Of Cube

In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex. The cube can also be called a regular hexahedron and is one of the five Platonic solids. It is a special kind of square prism, of rectangular parallelepiped and of trigonal trapezohedron. The cube is dual to the octahedron. It has cubical symmetry (also called octahedral symmetry). It is special by being a cuboid and a rhombohedron.

A cube is a solid shape that has :

• 6 square faces all equal in size.
• 8 vertices ( corners) and
• 12 equal edges

Surface Area of Cube :
6b2 or 6 x b2

Volume of the cube
Volume= b3  or b x b x b
              = 10 x 10 x 10
              = 100 x 10
              = 1.000 cm3

Example
A cube has 12 cm ribs. Calculate the surface area and volume of ​​a cube !
Surface area = 6b2 
                       = 6 x 12 x 12
                       = 72 x 12
                       = 864 cm
Volume = b x b x b
              = 12 x 12 x 12
              = 144 x 12
              = 1.728 cm

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How to Send an E Mail

How to Send Email Yahoo - Have you read about on the yahoo list of previous posts on this blog? In the post it was discussed about how to create an email account at yahoo. Well if you already have an email in yahoo, now the question is how do I send this email yahoo? That is the subject of our discussion in this article.

Login to YahooMail.com or click on Yahoo.com and click on the mail menu. Enter your  username and password login. 

As stated in the figure below:Click New in the upper left corner to write an email.

On the new page, click in the blank box beside
1.  To: and type the email address of the person you're writing to.
2.  Add addresses in the Cc: field if you want to send a copy of your email to anyone else.
     Others receiving this email will be able to see anyone listed in the Cc: line.
3.  Inside Subject:, give your email a title—then write whatever you want to in the message
     window. That's the big box below.
3.  Sending is the easy part. Once you're done writing (and attaching photos or files if you
     want... see below), just click Send.

Attach Photos and Files:
Click Attach at the top of the page. In the window that opens, click Browse to find and select the file you want. When you've got it, click Open. Repeat these steps to attach more files, and when you're finished, click Attach Files.

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