Explain to students that they will do an online activity where they will have to answer several math challenges related to the undefined terms of geometry. Make sure there is a technical device for each student. Introduce this activity at the end of your lesson. This is a simple online activity by Khan Academy that will help students practice their skills at identifying and differentiating between the different undefined terms of geometry, as well as related terms. Activities to Practice the Undefined Terms of Geometry Online Activity Videos will also come in handy for the visual representation of points, lines, and planes.įor instance, you can use this fun video that provides brief descriptions of the three undefined terms in geometry, followed by illustrative and colorful examples, such as dots on the tips of pencils or in the corners of boxes. If you have the technical means in your classroom, you can enrich your lesson with multimedia materials, such as videos. A ray is named by its endpoint and another point on the ray.ĭraw a few examples of rays on the whiteboard and ask students to identify and name them. Rayįinally, explain to students that a ray is a part of a line that consists of one endpoint and all the points on one side of the endpoint. Draw a few line segments on the whiteboard and ask students to label and name them. In other words, unlike lines, a line segment does not extend indefinitely in any direction and has a starting point and an endpoint.Īdd that a line segment is named by its endpoints with a line without arrows above the names of the two endpoints. Line Segmentĭescribe a line segment as a part of a line between 2 endpoints. But make sure to point out that a plane has no boundaries, even though this diagram on the whiteboard has edges. Draw such a figure on the whiteboard to illustrate what a plane looks like. Add that non-collinear points on the plane are points that are not on the same line.Įxplain that we draw a plane like a figure with four sides that looks like a parallelogram. Point out that planes are named by an uppercase script letter (for example plane m) or 3 non-collinear points on the plane. A plane has two dimensions – length and width, and as it extends indefinitely, it has infinite length, width, and zero height, as well as infinite lines and points. PlaneĮxplain to students that a plane forms a flat surface that extends without end. Lines are named by 2 points with a 2-sided arrow above the named pointsĭraw a line on the whiteboard with a few points on it and ask students to identify the names for the line. The two-sided arrow is the symbol we use for lines. So a line goes on forever in both directions and thus has infinite length and zero width and height.Įxplain that a line doesn’t have endpoints and we draw it with arrowheads on both ends. Then, point out that a line is a straight path through the stars that extends in opposite directions with no end. Then, ask the students to identify how many points there are on the line.Īsk students to think of that night sky full of stars again. Point out that we name the point with a capital letter. Present a few examples of points by drawing a line on the whiteboard and placing a few points on it. In the coordinate plane, we name points by ordered pairs (x, y). So make sure to point out that a point has no size, length, width, or height. This dot can be tiny or large, but this doesn’t make any difference, as the point simply represents a location or position. Explain to students that a point is just like a star in the starry sky – it’s a dot indicating a location in space. You may want to start by providing a brief description of each undefined term. Nonetheless, it’s good to provide a brief overview of them or a brief description to make sure that children understand them. You can explain to students that the undefined terms of geometry are words or terms that don’t require any further explanation or elaborate description. Tips to Teach the Undefined Terms of Geometry Undefined Terms Of Geometry There are plenty of ways in which teachers can make teaching the undefined terms of geometry exciting, and today we bring you a few awesome tips to achieve this! Use these tips in your classroom and you’ll be sure to blend learning with fun! However, even if we don’t formally define them, we can, of course, describe these terms. There are three such undefined terms, including point, line, and plane. The undefined terms of geometry serve as the building blocks for defining other terms.
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