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Chapter 2: Problem 42

Short Response How would you describe any three points that lie in the same plane?

Short Answer

Expert verified
Three points are coplanar if they lie on the same flat surface.

Step by step solution

01

Understand the Terminology

To begin with, it's important to understand what is being asked. The problem asks how to describe three points that lie in the same plane. Recall that a plane is a flat, two-dimensional surface that extends infinitely in all directions.
02

Know the Basic Definition

By geometric definition, if three points lie in the same plane, they are said to be 'coplanar.' Any three points, as long as they are not in a straight line, can form a plane.
03

Analyze Points On the Plane

Given any three non-collinear points, you can always find exactly one plane that contains all three. If the three points are collinear, then they lie on the same line, which is also contained within a plane.
04

Visualize the Concept

Think about a flat surface like a piece of paper. If you choose any three dots on that paper, they define the paper's plane. If the dots are all along one line, you can still flatten a plane through them.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

plane in geometry
In the context of geometry, a plane is a crucial concept. Imagine a plane as a gigantic, perfectly flat sheet of paper that never ends. It鈥檚 a flat, two-dimensional surface that stretches into infinity in all directions. This infinite nature of a plane means that it has no edges.
  • It鈥檚 important to know that a plane is defined by at least three non-collinear points. Those points do not all lie on the same line, which ensures the definition of a plane.
  • Think about standing on a huge, endless field; that field represents the plane. Although you can extend your arms as far as you can reach, the field appears to stretch much further than that.
Learning about planes helps us to understand more complex geometrical concepts, such as space and dimensional analysis.
collinear points
Collinear points are those points that lie along a single straight line. In simpler terms, if you can draw a single straight line on a piece of paper through several points, then those points are collinear.
  • Collinear points share a line but may not necessarily tell us much about forming a distinct plane. When three points are collinear, they do not independently create an entire plane by themselves; they simply reside on one line that is part of a plane.
  • Think about beads on a string; the beads represent the points, and the string matches the line.
Understanding collinear points help provide clarity when distinguishing between lines, planes, and spaces in geometric discussions.
two-dimensional surfaces
A two-dimensional surface is exactly what it sounds like: a surface that has two dimensions鈥攍ength and width. Unlike three-dimensional objects, these surfaces do not have any depth.
  • Surfaces like the layout of a piece of paper, the top of a table, or even a shadow cast on the ground can be considered two-dimensional. This is because they extend in two distinct directions but have no thickness.
  • Being able to conceptualize two-dimensional surfaces allows us to infer properties about how shapes and points behave when contained within such a realm.
When we consider planes as infinite two-dimensional surfaces, it becomes easier to imagine how different shapes can reside within them and how points can define these shapes.

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Most popular questions from this chapter

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Multiple Choice Charo walks 15 minutes the first day, 22 minutes the second day, and 29 minutes the third day. If she continues this pattern, how many minutes will Charo walk the fifth day? (Lesson 1-1) (A) \(33 \mathrm{~min}\) (B) \(36 \mathrm{~min}\) (C) \(39 \mathrm{~min}\) (D) \(43 \mathrm{~min}\)
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