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Q: A: ### Quick Answer

**Three undefined terms in geometry are point, line and plane.** These three terms are explained but not defined as everyone has an intuitive idea of these concepts. These terms serve as the foundation on which geometry is built.

Space is the biggest set in geometry. All other sets are subsets of space. Points, lines, planes, angles and rays are all subsets of space. A point is dimensionless and hence cannot be physically represented on paper. However, for the purpose of the study of geometry it is represented by a dot on paper.

A line does not have width, and it is infinite in length. Again, this makes it impossible to represent an entire line on paper. A plane has no thickness and no boundaries. It stretches indefinitely in all directions. It is represented on paper as a four sided closed figure.

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## Why is geometry so important?

A:Geometry is defined as the area of mathematics dealing with points, lines, shapes and space. Geometry is important because the world is made up of different shapes and spaces. It is broken into plane geometry, flat shapes like lines, circles and triangles, and solid geometry, solid shapes like spheres and cubes.

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## What is spherical geometry?

A:

Full Answer >**Spherical geometry is the branch of mathematics that deals with figures placed on the surface of a sphere.**It can also be defined as a three-dimensional view of more traditional planar geometry; although, there are numerous differences between the planar and spherical subsets of geometrical study. Some of the basic tenets of planar geometry don't carry over to spherical geometry because it deals with different mathematical concepts.Filed Under: - Q:
## What is dilation in geometry?

A:

Full Answer >**In geometry, dilation is the resizing of an object.**With dilation, the angles remain the same, but the distance between points increases or decreases by a common scale factor.Filed Under: - Q:
## What does "congruent" mean in geometry?

A:In geometry, the term congruent refers to two items being the same size and shape. Congruent can be used to describe shapes, sides, segments and/or angles.

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