Course 3 Online!
Henrico County Public Schools, Virginia
Important News: Effective August 15, 2018, this site will be realigning to the 2016 SOL.
As a result, many of the instructional notes, activities, and worksheets will be removed. Please download any files you wish to keep for future use.
8.10 - Pythagorean Theorem
Number and Number Sense, Computation and Estimation

Measurement and Geometry

Probability, Statistics, Patterns, Functions, and Algebra

SOL Review Materials
Focus: Problem Solving with 2- and 3-Dimensional Figures

The student will          
a)   verify the Pythagorean Theorem; and
b)   apply the Pythagorean Theorem. 
Essential Knowledge and Skills 
  • Identify the parts of a right triangle (the hypotenuse and the legs). 
  • Verify a triangle is a right triangle given the measures of its three sides.
  • Verify the Pythagorean Theorem, using diagrams, concrete materials, and measurement.
  • Find the measure of a side of a right triangle, given the measures of the other two sides.
  • Solve practical problems involving right triangles by using the Pythagorean Theorem.
Essential Understandings
How can the area of squares generated by the legs and the hypotenuse of a right triangle be used to verify the Pythagorean Theorem? For a right triangle, the area of a square with one side equal to the measure of the hypotenuse equals the sum of the areas of the squares with one side each equal to the measures of the legs of the triangle.
Vertical Articulation
  1. SOL 6.12 - determine congruence of segments/angles/polygons
  2. SOL 7.6 - determine similarity of plane figures and write proportions to express relationships between similar quads and triangles
Instructional Materials
  1. VDOE Enhanced Scope and Sequence Lesson: Pythagorean Theorem (PDF) - Working with the Pythagorean Theorem (Word)
  2. Notes: Pythagorean Theorem (doc)
  3. Notes: Pythagorean Theorem Constructivist Lesson Plan and Practice (pdf)
  4. Activity: Exploring the Pythagorean Theorem - Stations (doc)
Real World Lessons
  1. Dan Meyer: Dollar Wall - How much cash is on the walls?
  2. Mathalicious: 51-Foot Ladder - How high can you (safely) climb with a ladder?
  1. Worksheet: Pythagorean Theorem Practice (doc)
  2. Worksheet: Pythagorean Theorem in the NFL (pdf)
  3. Quiz: Pythagorean Theorem and Perfect Squares (pdf)
  4. Worksheet: Pythagorean Theorem Applications (pdf)
  1. SOL 8.10 Mini-Quiz: Pythagorean Theorem
  1. Brain Teaser - Same Hypotenuse from
  2. Mathalicious - Viewmongus: Televisions. Smart phones. iPads. We’re surrounded by screens. We can’t escape them! But how much do we really know about these screens? In particular, how big are they?
  3. Mathematics Assessment Project:
    • A05:Hopewell Geometry - Apprentice - The Hopewell people were Native Americans whose culture flourished in the central Ohio Valley about 2000 years ago. They constructed earthworks using right triangles. In this task, you will look at some of the geometrical properties of a Hopewell earthwork.
    • A13:Temple Geometry - Apprentice - During the Edo period (1603-1867) of Japanese history, geometrical puzzles were hung in the holy temples as offerings to the gods and as challenges to worshippers. Here is one such problem for you to investigate.
    • A15:Jane's TV - Apprentice - In this task, you will need to work out the actual dimensions of TV screens, which are sold according to their diagonal measurements.
    • E04:Proofs Of The Pythagorean Theorem? - Expert - In this task, you will look at three different attempts to prove the Pythagorean theorem. Which is the best ‘proof’?
    • E08:Pythagorean Triples - Expert - (3, 4, 5), (5, 12, 13), (7, 24, 25) and (9, 40, 41) are called Pythagorean Triples because they satisfy the condition c^2 = a^2 + b^2. In this task, you will investigate these, and other Pythagorean Triples
    • E15:Circles and Squares - Expert - In this task, you must solve a problem about circles inscribed in squares.
  4. Pythagorean Theorem - Park Development (doc)
  1. The Science of NFL Football: Pythagorean Theorem - NBC's Lester Holt explores the path a defender must take in order to tackle a ball carrier, and how this distance--called the "angle of pursuit"--can be calculated by using the Pythagorean Theorem to find the hypotenuse of a right triangle, and the distance of a defender's angle of pursuit.
  2. Rap Video: Pythagorean Theorem (YouTube)
  3. LearnAlberta: Exploring Square Roots Video (Video Interactive)
  4. LearnAlberta: Exploring the Pythagorean Theorem (Video Interactive)
  5. PH: Using the Pythagorean Theorem to find the hypotenuse
  6. PH: Using the Pythagorean Theorem to find the leg
Explore Learning
  1. Distance Formula - Activity A: Explore the distance formula as an application of the Pythagorean theorem. Learn to see any two points as the endpoints of the hypotenuse of a right triangle. Drag those points and examine changes to the triangle and the distance calculation.
  2. Geoboard: The Pythagorean Theorem: Build right triangles in an interactive geoboard and build squares on the sides of the triangles to discover the Pythagorean Theorem.
  3. Pythagorean Theorem - Activity A: Explore the Pythagorean Theorem using a dynamic right triangle. Examine a visual, geometric application of the Pythagorean Theorem, using the areas of squares on the sides of the triangle.
  4. Pythagorean Theorem - Activity B: Explore the Pythagorean Theorem using a dynamic right triangle. Examine a visual, geometric application of the Pythagorean Theorem, using the areas of squares on the sides of the triangle.
VDOE Interventions
  1. VDOE Algebra Readiness Curriculum Companion: Working with Two-Dimensional Measurement - The lessons focus on understanding and applying the Pythagorean Theorem. (pdf)
Common Core Standards