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Exploring Geometry Basics with Points, Lines, and Planes

Learn to describe figures using the terms of geometry like points, lines, and planes. Identify geometric figures, line segments, and rays in diagrams. Practice naming figures and elements accurately.

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Exploring Geometry Basics with Points, Lines, and Planes

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  1. Learn to describe figures by using the terms of geometry.

  2. Vocabulary point line plane line segment ray

  3. The building blocks of geometry are points, lines, and planes.

  4. PR and NR You can also write RP and RN. Additional Example 1: Identifying Points, Lines, and Planes Use the diagram to name the geometric figure. A. three points M, N, and P Five points are labeled: points M, N, P, Q, and R. B. two lines

  5. Point R is a point on PR and NR. Additional Example 1: Identifying Points, Lines, and Planes Use the diagram to name the geometric figure. C. a point shared by two lines point R D. a plane plane QRM Use any three points in the plane that are not on the same line. Write the three points in any order.

  6. U V T W S UW and SW You can also write WU and WS. Check It Out: Example 1 Use the diagram to name the geometric figure. A. three points S, T, and U Five points are labeled: points S, T, U, V, and W. B. two lines

  7. Point W is a point on WS and WU. U V T W S Check It Out: Example 1 Use the diagram to name the geometric figure. C. a point shared by two lines point W D. a plane plane VUT Use any three points in the plane that are not on the same line. Write the three points in any order.

  8. B A C AB, BC, and AC You can also write BA, CB, and CA. AB, BC, and AC You can also write BA, CB, and CA. Additional Example 2: Identifying Line Segments and Rays Use the diagram to give a possible name to the figure. A. three different line segments B. three ways to name the line

  9. B AB, AC, BC, CB, CA, and BA A C AC Additional Example 2: Identifying Line Segments and Rays Use the diagram to give a possible name to the figure. C. six rays D. another name for ray AB A is still the endpoint. C is another point on the ray.

  10. D DE, EF, and DF E You can also write ED, FE, and FD. F DE, EF, and DF You can also write ED, FE, and FD. Check It Out: Example 2 Use the diagram to give a possible name to the figure. A. three different line segments B. three ways to name the line

  11. DE, EF, DF, FE, FD, and ED D E F DF Check It Out: Example 2 Use the diagram to give a possible name to the figure. C. six rays D. another name for ray DE D is still the endpoint. F is another point on the ray.

  12. Possible answer: AD, CE Lesson Quiz Use the diagram to name each geometric figure. 1. three points 2. two lines 3. a point shared by a line and a ray 4. a plane Possible answer: A, B, C Possible answer: F Possible answer: plane AEC

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