**INTRODUCTION :**

Three dimensional shapes are to have, length, depth, and height these are the three dimensions. These are solid shapes. The examples for a three dimensional shape is sphere, cube, cuboids, cylinder, cone, Prism, Pyramid, Dodecahedron, Octahedron, Tetrahedron. Here we are going to see in detail about three dimensional shapes. The real life example of a three dimensional shape is book, table, etc...

- A sphere is the set of all those points in the space which are equidistant from a fixed point.
- The fixed point is called the center of the sphere and the constant distance is called radius.
- A line segment passing through the end of the sphere with its end points on the sphere is called a diameter of the sphere.
- All diameter of a sphere are of constant length, being equal twice the radius of the sphere.

**Cube:**

- The solid shape which has all the sides equal in length is known as cube.
- Two adjacent faces of a cube meet along a line segment called edge. A cube has 12 edges.
- The point of intersection of three mutually perpendicular edges is known as vertex. A cube has 8 vertices's

My forthcoming post is on Simplifying Expressions with Rational Exponents will give you more understanding about Math.

- The Solid like a matchbox, an ordinary brick, a room, etc., having six rectangular faces are parallel and congruent, are known as cuboids. A cuboid is also known as rectangular parallelepiped.
- Two adjacent faces of a cuboid meet along a line segment called edge. A cuboid has 12 edges.
- The point of intersection of three mutually perpendicular edges is known as vertex. A cuboid has 8 vertices's.

**Cylinder:**

- Solid line measuring jars, circular pillars, circular pencils, Circular pipes, road rollers and gas cylinders are said to have a cylindrical shape.
- A solid generated by the revolution of a rectangle about one of it sides.

**Cone:**

- If an Right angled triangle is revolved about one of the sides containing the right angle, the solid thus generated is called a right circular cone
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