Authentic Lessons for 21st Century Learning

Collections Collection
Cover Image

Geometry Calculator Lessons

Bailie Cobble | Published: July 9th, 2025 by K20 Center

Summary

This collection of geometry lessons integrates the use of calculators to support students in problem solving and conceptual understanding.

Resources

Lesson 5E Lesson
Cover Image
Edible Oasis (Geometry)

Arc Length and Sector Area of a Circle

Grade Level Grade Level

  • 9th - 12th

Through this lesson, students will use math and equity to discover the equation solving for any circle's arc length and sector area while investigating food deserts and how they impact a community. Read more »

Created by: Lydia Baker

Date Updated: June 10th, 2025

Lesson 5E Lesson
Edible Oasis (Geometry)

Arc Length and Sector Area of a Circle

Grade Level Grade Level

  • 9th - 12th

Course Course

  • Geometry

Subject Subject

  • Mathematics

Copied To Clipboard Standards

  • G.C.1.1, G701
More 2-3 Class Periods
Time Frame 80-90 Minutes
Lesson 5E Lesson
Cover Image
Elevating Angles, Part 1

Inverse Trigonometry: Introduction

Grade Level Grade Level

  • 9th - 10th

Students will explore inputs and outputs of trigonometric functions and use this relationship to identify the need for inverse trigonometric functions to find an unknown angle measure. Students will then watch a video of a civil engineer share how he uses right triangle trigonometry and apply their... Read more »

Created by: Michell Eike

Date Updated: June 18th, 2025

Lesson 5E Lesson
Elevating Angles, Part 1

Inverse Trigonometry: Introduction

Tag Related

  • Individual Career Academic Plan (ICAP)

Course Course

  • Geometry

Subject Subject

  • Mathematics

Grade Level Grade Level

  • 9th - 10th

Copied To Clipboard Standards

  • G.RT.1.3, G604
More 2 class periods
Time Frame 75-85 minutes
Lesson 5E Lesson
Cover Image
Elevating Angles, Part 2

Inverse Trigonometry: ADA Accessibility

Grade Level Grade Level

  • 9th - 12th

In this lesson, students will explore angles of incline on different wheelchair ramps by measuring side lengths and finding missing angle measures using inverse trigonometric functions. Students will compare their results with the Americans With Disabilities Act (ADA) accessibility standards to determine... Read more »

Created by: Michell Eike

Date Updated: June 18th, 2025

Lesson 5E Lesson
Elevating Angles, Part 2

Inverse Trigonometry: ADA Accessibility

Tag Related

  • Individual Career Academic Plan (ICAP)

Grade Level Grade Level

  • 9th - 12th

Course Course

  • Geometry, Precalculus

Subject Subject

  • Mathematics

Copied To Clipboard Standards

  • G.RT.1.3, G604
More 2 class periods
Time Frame 75-90 minutes
Lesson 5E Lesson
Cover Image
A Geometer's Perspective

Trigonometric Ratios

Grade Level Grade Level

  • 9th - 10th

Students will investigate and discover the trigonometric ratios (sine, cosine, and tangent) through observations of right triangles. Students are expected to know the Pythagorean Theorem and its converse before beginning this lesson. This lesson is centered around the question: "How can we find missing... Read more »

Created by: K20 Center

Date Updated: June 18th, 2025

Lesson 5E Lesson
A Geometer's Perspective

Trigonometric Ratios

Course Course

  • Geometry

Subject Subject

  • Mathematics

Grade Level Grade Level

  • 9th - 10th

Tag Related

  • ACT Prep

Copied To Clipboard Standards

  • G.RT.1.3, G509
More 125-135 minutes
Time Frame 3 class periods
Lesson 5E Lesson
Cover Image
Meet Me in the Middle

Discovering Midpoint Formula Through Estimations

Grade Level Grade Level

  • 9th - 10th

In this lesson, students will estimate population data leading them to discover the midpoint formula. They will then apply the formula they created to various other real-world applications. Read more »

Created by: K20 Center

Date Updated: June 10th, 2025

Lesson 5E Lesson
Meet Me in the Middle

Discovering Midpoint Formula Through Estimations

Course Course

  • Geometry, Intermediate Algebra

Subject Subject

  • Mathematics

Grade Level Grade Level

  • 9th - 10th

Copied To Clipboard Standards

  • G.2D.1.6, G511
More 3 class periods
Time Frame 125 minutes
Lesson 5E Lesson Multimodality
Cover Image
Traditional Transformations, Part 4

Dilations: Beadwork

Grade Level Grade Level

  • 9th - 10th

In this lesson, students will explore the culture of Native Americans and their beadwork. They will then use patterns to explore dilations and discover the relationship between the center of dilation, the preimage, and the image. Students will apply what they have learned to create their own beadwork... Read more »

Created by: Michell Eike

Date Updated: June 10th, 2025

Lesson 5E Lesson Hybrid
Traditional Transformations, Part 4

Dilations: Beadwork

Course Course

  • Geometry

Subject Subject

  • Mathematics

Grade Level Grade Level

  • 9th - 10th

Tag Related

  • ACT Prep

Copied To Clipboard Standards

  • G.2D.1.11, G703
More 2-3 class periods
Time Frame 85-100 minutes

Standards

ACT College and Career Readiness Standards - Mathematics (6-12)
G509: Express the sine, cosine, and tangent of an angle in a right triangle as a ratio of given side lengths
G511: Find the midpoint of a line segment
G604: Apply basic trigonometric ratios to solve right-triangle problems
G701: Use relationships among angles, arcs, and distances in a circle
G703: Use scale factors to determine the magnitude of a size change
Oklahoma Academic Standards Mathematics (Geometry)
G.2D.1.6: Use coordinate geometry and algebraic reasoning to represent and analyze line segments and polygons, including determining lengths, midpoints, and slopes of line segments.
G.2D.1.11: Use numeric, graphic, and algebraic representations of transformations in two dimensions (e.g., reflections, translations, dilations, rotations about the origin by multiples of 90 °) to solve problems involving figures on a coordinate plane and identify types of symmetry.
G.C.1.1: Apply the properties of circles to solve problems involving circumference and area, using approximate values and in terms of pi, using algebraic and logical reasoning.
G.RT.1.3: Use the definition of the trigonometric functions to determine the sine, cosine, and tangent ratio of an acute angle in a right triangle. Apply the inverse trigonometric functions to find the measure of an acute angle in right triangles.

This work is licensed under a Creative Commons CC BY-SA 4.0 License.

Report copyright infringement »