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Splash Screen. Five-Minute Check CCSS Then/Now New Vocabulary Key Concept: Undefined Terms Example 1:Name Lines and Planes Example 2:Real-World Example: Model Points, Lines, and Planes Example 3:Draw Geometric Figures Example 4:Interpret Drawings. Lesson Menu.

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Splash Screen


Five-Minute Check

CCSS

Then/Now

New Vocabulary

Key Concept: Undefined Terms

Example 1:Name Lines and Planes

Example 2:Real-World Example: Model Points, Lines, and Planes

Example 3:Draw Geometric Figures

Example 4:Interpret Drawings

Lesson Menu


What is the value ofx2 +3yz if x = 3, y = 6, and z = 4?

A.27

B.33

C.72

D.81

5-Minute Check 1


A.–6

B.

C.2

D.6

Solve 2(x – 7) = 5x + 4.

5-Minute Check 2


Which is a solution of 3x + 4y = 14?

A.(–3, 4)

B.(–2, 5)

C.(1, 3)

D.(2, 3)

5-Minute Check 3


Factor 9x2 – 25y2.

A.(3x – 5y)2

B.(3x + 5y)2

C.(3x + 5y)(3x – 5y)

D.(9x + 5y)(x – 5y)

5-Minute Check 4


A.B.

C.D.

Graph y = 3x + 2.

5-Minute Check 5


Which of the following equations is a quadratic equation?

A.4x = 2

B.5x + 2y = 13

C.6x2 – 3x = 16

D.5x3 – x2 + 2 = 0

5-Minute Check 6


Content Standards

G.CO.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.

Mathematical Practices

4 Model with mathematics.

6 Attend to precision.

CCSS


You used basic geometric concepts and properties to solve problems.

  • Identify and model points, lines, and planes.

  • Identify intersecting lines and planes.

Then/Now


  • definition

  • defined term

  • space

  • undefined term

  • point

  • line

  • plane

  • collinear

  • coplanar

  • intersection

Vocabulary


Concept


Answer: The line can be named as line a.

There are three points on the line. Any two of the points can be used to name the line.

Name Lines and Planes

A. Use the figure to name a line containing point K.

Example 1


Answer: The plane can be named as plane B.

You can also use the letters of any three noncollinearpoints to name the plane.plane JKMplane KLMplane JLM

Name Lines and Planes

B. Use the figure to name a plane containing point L.

Example 1


Name Lines and Planes

The letters of each of these names can be reordered to create other acceptable names for this plane. For example, JKM can also be written as JMK, MKJ, KJM, KMJ, and MJK. There are 15 different three-letter names for this plane.

Example 1


A.line X

B.line c

C.line Z

D.

A. Use the figure to name a line containing the point X.

Example 1a


B. Use the figure to name a plane containing point Z.

A.plane XY

B.plane c

C.plane XQY

D.plane P

Example 1b


Model Points, Lines, and Planes

A. Name the geometric shape modeled by a 10  12 patio.

Answer: The patio models a plane.

Example 2


Model Points, Lines, and Planes

B. Name the geometric shape modeled by a button on a table.

Answer: The button on the table models a point on a plane.

Example 2


A. Name the geometric shape modeled by a colored dot on a map used to mark the location of a city.

A.point

B.line segment

C.plane

D.none of the above

Example 2a


B. Name the geometric shape modeled by the ceiling of your classroom.

A.point

B.line segment

C.plane

D.none of the above

Example 2b


Draw Geometric Figures

Draw a surface to represent plane R and label it.

Example 3


Draw Geometric Figures

Draw a line anywhere on the plane.

Example 3


Draw Geometric Figures

Draw dots on the line for point A and B. Label the points.

Example 3


Draw Geometric Figures

Example 3


Draw Geometric Figures

Draw dots on this line for point D and E. Label the points.

Example 3


Draw Geometric Figures

Label the intersection point of the two lines as P.

Example 3


Draw Geometric Figures

Answer:

Example 3


Draw Geometric Figures

Answer:

There are an infinite number of points that are collinear with Q and R. In the graph, one such point is T(1, 0).

Example 3


A.B.C.D.

A. Choose the best diagram for the given relationship. Plane D contains line a, line m, and line t, with all three lines intersecting at point Z. Also, point F is on plane D and is not collinear with any of the three given lines.

Example 3a


Example 3b


A.B.

C.D.

Example 3b


Interpret Drawings

A. How many planes appear in this figure?

Answer: There are two planes: plane S and plane ABC.

Example 4


Interpret Drawings

B. Name three points that are collinear.

Answer: Points A, B, and D are collinear.

Example 4


Interpret Drawings

C. Are points A, B, C, and D coplanar? Explain.

Answer: Points A, B, C, and D all lie in plane ABC, so they are coplanar.

Example 4


Interpret Drawings

Answer: The two lines intersect at point A.

Example 4


A. How many planes appear in this figure?

A.one

B.two

C.three

D.four

Example 4a


B. Name three points that are collinear.

A.B, O, and X

B.X, O, and N

C.R, O, and B

D.A, X, and Z

Example 4b


C. Are points X, O, and R coplanar?

A.yes

B.no

C.cannot be determined

Example 4c


A.point X

B.point N

C.point R

D.point A

Example 4d


End of the Lesson


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