In third grade geometry us will talk about inbrief around some that the usual solid numbers named below:(i) Cube: an interpretation of cube, parts of a cube, properties of a cube.

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(ii) Cuboid: meaning of cuboid

(iii) Cylinder: definition of cylinder

(iv) Cone: definition of cone

(v) Sphere: an interpretation of sphere

Definition that a cube:

An thing which looks favor solid box-shapedthat has six the same square faces.

A cube has 6 same and aircraft surfaces. Allthe faces of a cube space square in shape.


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Two adjoining aircraft – surfaces accomplish at anedge. There space 12 edge in a cube and all the 12 edges are equal in length.These edges space straight edges.

The meeting point of 2 edges is called avertex. In a cube there space 8 such vertices.

Parts the a cube:

(i)Face: Face is additionally known as sides. A cube has sixfaces and also all the deals with of a cube space square in shapes. Each confront has fourequal sides.

(ii)Edge: once two edges satisfy each various other a heat segmentformed. There space 12 edges in a cube. Every the 12 edges room equal in lengthbecause all faces are squares. This edges are straight edges.

(iii)Vertex: as soon as three edges fulfill each various other a pointformed. There room 8 vertices in a cube.

(iv)Face Diagonals: challenge Diagonals the a cube is theline segment that joins the contrary vertices of a face. There are 2 diagonalsin each confront so altogether there room 12 diagonals in the cube.

(v) SpaceDiagonals: an are diagonals the a cube room the linesegment the joins the opposite vertices that a cube, cutting v itsinterior. There room 4 space diagonals in a cube.

Properties of a cube:

Volume: The volume that a cube is s3 whereby s is the length of one edge. Surface Area: The surface area of a cube is 6s2, whereby s is the length of one edge.

Definition the cuboid:

The cuboid has 6 rectangle-shaped faces. Theopposite rectangular plane surfaces are the same (equal in all respects). Ithas 8 vertices and 12 edges.

In a cuboid there are 6 rectangular planesurfaces. There space 8 vertices and 12 edges.


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A cube is likewise a cuboid having all that is 6faces equal and also square. Thus, a cube has all the six deals with identical, vice versa, acuboid has actually the opposite faces identical.

Properties that a cuboid:

Formulas for the over rectangular box:

Volume: The volume that a cuboid is lwh, where l is the length, w isthe width and h is the height.

LateralSurface Area: The lateral surface ar area of a cuboidis 2lh + 2wh, where l is the length,w is the width and h is the height.

SurfaceArea: The surface area the a cuboid is 2lw + 2lh +2wh, whereby l is the length, w is the width and also h is the height.

Definition of cylinder:

A cylinder stand on a one planesurface having circular airplane surfaces top top its top and bottom. Therefore a cylinderhas 2 circular plane surfaces, one at its base and another in ~ its top. It hasa curved surface ar in the middle.

It has two edges, in ~ which the 2 planesurfaces fulfill with the bent surface. This edges are curved edges.

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In a cylinder there room 2 plane surfacesand 1 curved surface. There space 2 edges and no vertices.