Math - 2018-19

G.2 - Transversal Angles

G.2  The student will use the relationships between angles formed by two lines intersected by a transversal to

a)  prove two or more lines are parallel;

b)  solve problems, including practical problems, involving angles formed when parallel lines are intersected by a transversal.



Adopted: 2016

BIG IDEAS

  • I can make a double bank shot in an air hockey game, build a handrail on a downhill slope, determine the angle of the sun based on colors in a rainbow, and correctly paint the lines in a parking lot.
  • I will determine angle measurements and relationships, and by using patterns and the positions of angles be able to confirm parallel lines.


UNDERSTANDING THE STANDARD

2016 VDOE Curriculum Framework - G.2 Understanding

·  Deductive or inductive reasoning is used in mathematical proofs.  In this course, deductive reasoning and logic are used in direct proofs. Direct proofs are presented in different formats (typically two-column or paragraph) and employ definitions, postulates, theorems, and algebraic justifications including coordinate methods.

·  Parallel lines intersected by a transversal form angles with specific relationships.

·  Some angle relationships may be used when proving two lines intersected by a transversal are parallel.

·  If two parallel lines are intersected by a transversal, then:

­  corresponding angles are congruent;

­  alternate interior angles are congruent;

­  alternate exterior angles are congruent;

­  same-side (consecutive) interior angles are supplementary; and

­  same-side (consecutive) exterior angles are supplementary.

·  Deductive proofs can be used to show that two or more lines are parallel.

·  The construction of the line parallel to a given line through a point not on the line can be justified using the angle relationships formed when two lines are intersected by a transversal.

ESSENTIALS

The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to

·  G.2a1  Prove two or more lines are parallel given angle measurements expressed numerically or algebraically.

·  G.2a2  Prove two lines are parallel using deductive proofs given relationships between and among angles.

·  G.2b1  Solve problems by using the relationships between pairs of angles formed by the intersection of two parallel lines and a transversal including corresponding angles, alternate interior angles, alternate exterior angles, same-side (consecutive) interior angles, and same-side (consecutive) exterior angles.

·  G.2b2  Solve problems, including practical problems, involving intersecting and parallel lines. 

KEY VOCABULARY

lines, transversal, parallel, angles, skew lines, parallelism, algebraic method, coordinate method, deductive proof, intersection, corresponding angles, alternate interior angles, alternate exterior angles, consecutive/same-side interior angles, plane, angle relationships, equidistant, Parallel Postulate

2016 Word Wall Cards

Updated: Aug 23, 2018