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Handout
Other

Mathway: Trigonometry Formulas

For Students 9th - 10th Standards
Resource provides trigonometry formulas for unit circle, reciprocal identities, ratio identities, Pythagorean identities, sum and difference formulas, and double-angle formulas.
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Unit Plan
Cuemath

Cuemath: Obtuse Triangle

For Students 9th - 10th Standards
In this mini-lesson, learn about obtuse triangles including the obtuse triangle definition, sides, properties, examples, and other fun facts related to it.
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Unit Plan
Cuemath

Cuemath: Triangles

For Students 5th - 8th Standards
Explore everything about triangles. Learn about the different types, important properties, and how to find its area and perimeter. Check out the solved examples and interactive questions for better understanding.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Gpe, F Tf Coordinates of Points on a Circle

For Teachers 9th - 10th Standards
For this task, students are shown a unit circle in a plane and an angle measured from the x-axis. They must determine the coordinates of the line segment for the angle and answer a question about the sum of the coordinates. The purpose...
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eBook
Mathigon

Mathigon: Geometry: Triangles and Trigonometry: Pythagoras' Theorem

For Students 9th - 10th Standards
Pythagoras' Theorem: In any right-angled triangle, the square of the length of the hypotenuse (the side that lies opposite the right angle) is equal to the sum of the squares of the other two sides. (A+B=C)
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Activity
Math Words

Math words.com: Trig Identities

For Students 9th - 10th Standards
This MathWords.com site lists the equations for all of the trigonometric identities.
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Activity
Other

Brown Math: Remembering Trig Identities

For Students 9th - 10th Standards
Faced with a large number of trigonometric identities, students tend to try to memorize them all. This site the emphasis is on understanding how the functions work and on memorizing only about a half dozen of them - all the others work...
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Activity
Math Medics

S.o.s. Math: Table of Trigonometric Identities

For Students 9th - 10th Standards
This tutorial highlights the numerous trigonometric identites (but does not define the basic trigonometric functions).
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Activity
Lawrence Hall of Science

The Math Page: Trigonometry: Trigonometric Identities

For Students 9th - 10th Standards
This resource clearly and thoroughly explains the many types of trigonometric identities. There are example problems solved, problems for the student to attempt, and answers to the student problems.
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eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 4.4 Theorems About Triangles

For Students 9th - 10th Standards
Discover some theorems about triangles.
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Handout
Purple Math

Purplemath: The Pythagorean Theorem

For Students 9th - 10th Standards
Defines the Pythagorean Theorem, and demonstrates how to use this Theorem in connection with right-angled triangles.
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Interactive
Walter Fendt

Walter Fendt: Cyclic Quadrilateral (Inscribed Quadrilateral)

For Students 9th - 10th Standards
A short interactive activity which allows you to move the vertices of a quadrilateral to prove that the sum of the opposite angles is 180 degrees.

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