**GEOMETRY**

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Sections in this chapter:

1) IDEA OF SPACE

- Plane and Curved Surfaces

- Cuboid

- Cylinder

- Cone

- Sphere

2) POINT

3) LINE SEGMENT, LINE AND RAY

- Line

- Ray

4) CONGRUENT LINE SEGMENTS

5) PERIMETER

6) COMMON SHAPES

- Triangles

- Rectangles

- Squares

- Circles

These are the topic discussed in GEOMETRY CHAPTER.

Let discuss each chapter in detail:

1) IDEA OF SPACE

A solid form of various shapes are represented as follows:

a) Triangle in Plane Surface represents Pyramid in Solid Form

b) Circle in Plane Surface represents Sphere in Solid Form

c) Mixture of Circle and Rectangle results in Cylinder in Solid Form

d) Rectangle in Solid form results in Cuboid

e) Circle and Triangle together results in Cone in Solid Form

- Plane and Curved Surfaces

A Plane Surface have edges, vertex, corners, and surfaces.

Each of the term is self explanatory except for vertex. Vertex or vertices is nothing else but corner in cuboid or rectangle or match box etc.

- Cuboid, Cylinder, Cone and Sphere

See the figure of cuboid and cylinder and understand edges, faces, vertex, curved face, base, top surface etc in cuboid, cylinder, cone and sphere

2) POINT

A point is nothing else but dot in space. It does not have length, breath or depth.

3) LINE SEGMENT, LINE AND RAY

- A straight line connecting two points in space is called line segment. It is the shortest distance between two points. Ruler is used to draw line segments.

- LINE AND RAY: A line is a straight line that expands in both the directions in unlimited fashion. While Ray has one end point (which is called vertex) and it expands in another direction in unlimited manner.

Understand in Ray the direction if different then two rays are not equal. Night Battery light is a good example of Ray.

4) CONGRUENT LINE SEGMENTS

- Line segments that have same length(Measured by Ruler) are called congruent line segments.

5) PERIMETER

- Perimeter is defined as sum of length of sides of various shapes such as triangle, square, and rectangle.

6) COMMON SHAPES

a) Triangle: Has 3 sides and 3 corners which are called vertices.

b) Rectangle: Has 4 sides where opposite sides have same length

c) Squares: Has 4 sides and all 4 sides have equal length

d) Circle: A circle has center and radius which defines how big the circle is.

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