Focus Plan
Texarkana Independent School District
GRADING
PERIOD:
Teacher:
3rd 6 Weeks
PLAN CODE:
Winton
Course/subject:
Mathematics
Grade(s):
7
Time allotted
for instruction:
1 – 1 ½ hours
Angle Analysis: What is the difference between complementary and
supplementary angles?
Complementary and Supplementary Angles
Title:
Lesson TOPIC:
TAKS Objective:
Objective 3: The student will demonstrate and understanding of
geometry and spatial reasoning.
FoCUS TEKS and
Student Expectation:
(6) Geometry and spatial reasoning. The student compares and
classifies shapes and solids using geometric vocabulary and properties.
The student is expected to:
(A) Use angle measurements to classify pairs of angles as
complementary or supplementary
(15) The student uses logical reasoning to make conjectures and verify
conclusions. The student is expected to:
(B) validate his/her conclusions using mathematical properties and
relationships
Supporting TEKS and
Student Expectations:
Concepts
Enduring Understandings/Generalizations/Principles
The student will understand that
Complementary angles are two angles whose measures have a sum of 90°.
Complementary Angles
Supplementary angles are two angles whose measures have sum of 180°.
Supplementary Angles
 Division of Curriculum and Instruction  School Improvement Department  Texarkana Independent School District
I.
Sequence of Activities (Instructional Strategies)
A.
Focus/connections
Preparation for this lesson:
 Make copies of the Angle Notes Worksheet
 Make a copy of the Angle Card Worksheet and cut out individual cards
As students enter the classroom, give each child a copy of the Angle Notes Worksheet. Once students
are seated, ask students to utilize a ruler to draw a straight line (horizontally) on the back of the notes
page.
B.
Instructional activities
(demonstrations, lectures, examples, hands-on experiences, role play, active
learning experience, art, music, modeling, discussion, reading, listening, viewing,
etc.)
Once students have drawn the straight line, ask them to turn the page over to view the notes contained
on the Angle Notes Worksheet. Discuss and define complementary and supplementary angles. Go
through the examples listed on the notes page. Make sure that each student understands the difference
between complementary angles and supplementary angles. Next have students turn to the back of their
notes page and draw the figure below on the straight line they initially put on paper (draw on board and
then let students draw on paper).
Discuss which angles are complementary and supplementary.
C.
Guided activity or strategy
Once students have a basic understanding of complementary and supplementary angles, give each
student an angle card. (Cards are found on the Angle Card Worksheet). Students will have an angle
degree on their card and they are to match their angle with another person (and angle) that will make
them supplementary or complementary. Make sure an even amount of cards are distributed. Give
yourself a card if needed. After students are paired up, have each pair justify why they are
supplementary or complementary.
D.
Accommodations/modifications
Students requiring modifications may work with a partner in the pairing process.
E.
II.
Enrichment
STUDENT PERFORMANCE
A.
Description
Students will complete the Complementary and Supplementary Angle Worksheet individually.
B.
Accommodations/modifications
C.
Enrichment
 Division of Curriculum and Instruction  School Improvement Department  Texarkana Independent School District
iii.
Assessment of Activities
A.
Description
Individual grades may be taken on the Complementary and Supplementary Angle Worksheet.
B.
Rubrics/grading criteria
Grades may be taken based on the Complementary and Supplementary Angle Worksheet Answer Key
and Grading Rubric.


IV.
C.
Accommodations/modifications
D.
Enrichment
E.
Sample discussion questions
Why is it important to know the difference between supplementary and complementary angles?
What real world scenario do you see the use of these types of angles?
TAKS Preparation
A.
Transition to TAKS context
The teacher will lead the students in a discussion of how complementary and supplementary angle
problems may look in test format by placing the TAKS question below on the overhead.
B.
Sample TAKS question
1. Which 2 angles are NOT complementary?
 Division of Curriculum and Instruction  School Improvement Department  Texarkana Independent School District
V.
Key Vocabulary
Complementary angles, supplementary angles
VI.
Resources
A.
Textbook
Math Advantage ~ Middle School II
Chapter 10: Congruence, Symmetry, and Transformations
 Congruent Line Segments and Angles, pp. 199-200
B.




Supplementary materials
Angle Notes Worksheet
Angle Card Worksheet
Complementary and Supplementary Angle Worksheet
Complementary and Supplementary Angle Worksheet Answer Key and Grading Rubric
C.
Technology
Students may be taken to the computer lab to create supplementary and complementary angles using
MS Word. After printing, students can label angles with degrees and classify.
VII.
follow up activities
(reteaching, cross-curricular support, technology activities, next lesson in sequence, etc.)
If students need additional work with supplementary and complementary angles, the following website
may be utilized: http://www.quia.com/mc/67718.html
VIII.
Teacher Notes
This lesson is a good lead-in for introducing other types of angle classifications. (vertical, adjacent, etc.)
 Division of Curriculum and Instruction  School Improvement Department  Texarkana Independent School District