# Neglecting the Curvature of the Earth

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This task applies geometric concepts, namely properties of tangents to circles and of right triangles, in a modeling situation. The key geometric point in this task is to recognize that the line of sight from the mountain top towards the horizon is tangent to the earth. We can then use a right triangle where one leg is tangent to a circle and the other leg is the radius of the circle to investigate this situation.

Material Type: Activity/Lab

Author: Illustrative Mathematics

# Mt. Whitney to Death Valley

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The purpose of this task is to engage students in an open-ended modeling task that uses similarity of right triangles, and also requires the use of technology.

Material Type: Activity/Lab

Author: Illustrative Mathematics

# Fundamentals of Waves

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This lesson is broken up into three different parts.Part 1/Resource 1In this lesson students will learn the basics of waves and how to graph them.  They will learn how to find the period, amplitude, and frequency of a wave. Part 2/Resource 2In this lesson students learn the connection between waves and music. Part 3/ Resource 3Students will learn the concept of superposition. CC-BY Kaleb Alles, Mountain Heights Academy

Material Type: Lesson Plan

Author: Crystal Van Ausdal

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This is an activity that makes math real.  The students complete some activities that show the length of a wheelchair ramp is determined using American Disabilities Act.

Material Type: Homework/Assignment

Author: Valerie Rosenthal

# Trigonometry Lecture Videos (Open Campus Math 112)

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These Trigonometry lecture videos coterminal angles, trig functions, quadrantal angles, special acute angles, co-functions, finding theta, reference angles, trig functions, radian measure, arc length, area of a sector, graphing sine and cosine using t-table, amplitude and frequency, phase shift for sine and consine, vertical shift, tangent curve, cotangent transformations, evaluating trig identities, trig expressions, sum and difference for cosine, double and half angle identities, inverse, principal values, solving difficult trig equations, law of cosines, area of a triangle, and vectors and bearing.

Material Type: Lecture

Author: Stacey Black

# OpenStax Algebra & Trigonometry Recorded Lectures and Notes for Precalculus

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This resource is a collection of full hour-long lectures and accompanying notes covering most of chapters 6-10 of the OpenStax Algebra and Trigonometry book. The notes are provided in both .DOCX and .PDF format to accommodate downloading ease. Students should be encouraged to print notes and fill them out as they watch through the lectures.

Material Type: Full Course

Author: Libby Gore

# OpenStax Algebra & Trigonometry Recorded Lectures and Notes for College Algebra

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This resource is a collection of full hour-long lectures and accompanying notes covering most of chapters 3-6 of the OpenStax Algebra and Trigonometry book. The notes are provided in both .DOCX and .PDF format to accommodate downloading ease. Students should be encouraged to print notes and fill them out as they watch through the lectures.

Material Type: Full Course, Lecture, Lecture Notes

Author: Libby Gore

# College Trigonometry

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This book was designed as an introductory trigonometry textbook for college students with the explicit goal of reducing textbook costs.

Material Type: Textbook

Authors: Carl Stitz, Jeff Zeager

# Trigonometry

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