1. 8-1 Building Blocks of Geometry Warm Up Solve. 1. x + 1 = 5 2. 2 = 2x 3. x – 7 = 6 4. = 14 1313 1212 2323 x3x3 4545 3 2323 1 1414 2 2525 1313

2. 8-1 Building Blocks of Geometry Learn to describe figures by using the terms of geometry.

3. 8-1 Building Blocks of Geometry Vocabulary point line plane line segment ray

4. 8-1 Building Blocks of Geometry The building blocks of geometry are points, lines, and planes.

5. 8-1 Building Blocks of Geometry 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 PR and NR You can also write RP and RN.

6. 8-1 Building Blocks of Geometry 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. Point R is a point on PR and NR.

7. 8-1 Building Blocks of Geometry 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 UW and SW You can also write WU and WS. V S U W T

8. 8-1 Building Blocks of Geometry 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. Point W is a point on WS and WU. V S U W T

9. 8-1 Building Blocks of Geometry

10. 8-1 Building Blocks of Geometry 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 You can also write BA, CB, and CA. AB, BC, and AC You can also write BA, CB, and CA. AB, BC, and AC C A B

11. 8-1 Building Blocks of Geometry 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. AB, AC, BC, CB, CA, and BA AC C A B

12. 8-1 Building Blocks of Geometry 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 You can also write ED, FE, and FD. DE, EF, and DF You can also write ED, FE, and FD. DE, EF, and DF F D E

13. 8-1 Building Blocks of Geometry 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. DE, EF, DF, FE, FD, and ED DF F D E