Name: Andrea Sisk
Date: January 26, 2015
WOODLAND HILLS SECONDARY
LESSON PLANS
Content Area: Geometry
Length of Lesson: 10 days
STAGE I – DESIRED RESULTS
Lesson Topic (Modules, if applicable):
Proportions and Similarity
Big Ideas:
 CC.2.3.HS.A.5 Create justifications based
on transformations to establish similarity
of plane figures.
 CC.2.3.HS.A.6 Verify and apply theorems
involving similarity as they relate to plane
figures.
Understanding Goals (Concepts):
How ratios and proportions apply to similar
figures.
How scale factor is used in solving of proportions.
Recognize and use proportional parts and
relationships to solve problems with similar
triangles and parallel lines. .
Student Objectives (Competencies/Outcomes):
1. Write ratios. Use properties of proportions.
2. Identify similar figures. Solve problems involving
scale factors.
3. Identify similar triangles. Use similar triangles to
solve problems.
4. Use proportional parts of triangles. Divide a
segment into parts.
5. Recognize and use proportional relationships of
corresponding perimeters of similar triangles.
6. Recognize and use proportional relationships of
corresponding angle bisectors, altitudes, and
medians of similar triangles.
Essential Questions:
Can you…
 Identify similar polygons?
 Set up and use ratios and proportions to
solve problems with polygons?
 Recognize and use proportional parts
including perimeters, altitudes, angle
bisectors, and medians of similar triangles?
Vocabulary:
Ratio, proportion, means – extremes (cross
products), similar polygons, scale factor, midsegment, iteration, fractal, self-similar
STAGE II – ASSESSMENT EVIDENCE
Performance Task:
Formative Assessments:
Students will actively participate in mini-lessons, guided and independent
Pre-assessments, open-ended higher-order-thinking questions, think-pairpractice, activities (including authentic problem-solving tasks and vocabulary),
share, graphic organizers, do nows, observation of guided and independent
and group work. Also, students will demonstrate adequate understanding via
practice, brief in-class writing prompts
various quizzes, a writing assignment, and an end-of-chapter test.
Materials and Resources:
Textbook and notes
STAGE III – LEARNING PLAN
Interventions:
Flexible grouping, students will be encouraged to attend Math Lab and College
and Career Access Center tutoring.
Assignments
Procedures
Instructional Procedures*:
Monday
Date: 1/26
Day: B
 “Do Now”- Collins 2: In
three lines, explain what
it means for figures to
be similar. Give an
example.
 “Mini Lesson” – Parallel
Lines and Proportional
Parts – 6.4 Day 1
 “Guided Practice” –
Students will use
proportional parts of
triangles to solve
problems.
 “Independent Practice”
Students will write find
the length of a side,
determine whether lines
are parallel, determine
the midsegment of a
triangle, and determine
whether segments are
congruent.
“Formative Assessment”
- Observe students
during “Do Now”,
“Guided Practice” and
“Independent Practice”
Tuesday
Date: 1/27
Day: A
 “Do Now”- Solve
problems with triangles
and parallel lines.
 “Mini Lesson” – Parallel
Lines and Proportional
Parts – 6.4 Day 2
 “Guided Practice” –
Students will use
proportional parts of
triangles to solve
problems.
 “Independent Practice”
Students will write find
the length of a side,
determine whether lines
are parallel, determine
the midsegment of a
triangle, and determine
whether segments are
congruent.
 “Formative Assessment”
- Observe students
during “Do Now”,
“Guided Practice” and
“Independent Practice”
6.4 Day 1 p. 3112 #14-26, 33, 6.4 Day 2 Practice
34
Worksheet
Wednesday
Date: 1/28
Day: B
 “Do Now” – Using
coordinate geometry,
determine the perimeter
of a triangle.
 “Mini Lesson” – Parts of
Similar Triangles – 6.5
Day 1
 “Guided Practice” –
Recognize and use
proportional
relationships of
corresponding
perimeters, angle
bisectors, altitudes, and
medians of similar
triangles.
 “Independent Practice”
– Students will
determine perimeters,
medians, angle
bisectors, and altitudes
of similar triangles.
 “Formative Assessment”
- Observe students
during “Do Now”,
“Guided Practice” and
“Independent Practice”
6.5 Day 1 p. 320 #10-15, 1827
Thursday
Date: 1/29
Day: A
 “Do Now” – Solve
problems with
corresponding parts of
similar triangles.
 “Mini Lesson” – Parts of
Similar Triangles – 6.5
Day 2
 “Guided Practice” –
Recognize and use
proportional
relationships of
corresponding
perimeters, angle
bisectors, altitudes, and
medians of similar
triangles.
 “Independent Practice”
– Students will
determine perimeters,
medians, angle
bisectors, and altitudes
of similar triangles.
 “Formative Assessment”
- Observe students
during “Do Now”,
“Guided Practice” and
“Independent Practice”
6.5 Day 2 Practice
Worksheet
*Include Do Now, Mini Lesson, Guided Practice, Independent Practice, Summations/Formative Assessments, Reflections
Friday
Date: 1/30
Day: B
 “Do Now” – Collins 1:
Write three things that
will be problematic for
you for your test on
Tuesday.
 “Mini Lesson” – Parts of
Similar Triangles – 6.5
Day 3
 “Guided Practice” –
Recognize and use
proportional
relationships of
corresponding
perimeters, angle
bisectors, altitudes, and
medians of similar
triangles.
 “Independent Practice”
– Students will
determine perimeters,
medians, angle
bisectors, and altitudes
of similar triangles.
 “Formative Assessment”
- Observe students
during “Do Now”,
“Guided Practice” and
“Independent Practice”

Applications worksheet