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Activity
Lawrence Hall of Science

The Math Page: Trigonometry: Trig Functions of an Acute Angle

For Students 9th - 10th Standards
Here is a site that clearly and thoroughly explains the trigonometric functions of acute angles within a right triangle. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point...
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Unit Plan
Oswego City School District

Regents Exam Prep Center: Area of a Triangle and Parallelogram Using Trig

For Students 9th - 10th Standards
How can trigonometry be used to find the area of a triangle or parallelogram? Does the triangle need to be a right triangle, and how accurate can the results possibly be? The answers to these questions are found here along with several...
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Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Pythagorean Theorem to Classify Triangles

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Use the Pythagorean Theorem to determine if triangles are acute, obtuse, or right triangles.
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Unknown Type
Khan Academy

Khan Academy: Solve for an Angle in Right Triangles

For Students 9th - 10th Standards
Given two sides in a right triangle, find one of the acute angles using trigonometry. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Unknown Type
Khan Academy

Khan Academy: Solve for an Angle in Right Triangles

For Students 9th - 10th Standards
Given two sides in a right triangle, find one of the acute angles using trigonometry.
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Unknown Type
Khan Academy

Khan Academy: Solve for a Side in Right Triangles

For Students 9th - 10th Standards
Given one side length and an acute angle in a right triangle, find another side using trigonometry. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Unknown Type
Khan Academy

Khan Academy: Solve for a Side in Right Triangles

For Students 9th - 10th Standards
Given one side length and an acute angle in a right triangle, find another side using trigonometry.
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Handout
Wolfram Research

Wolfram Math World: Cut the Knot! Angles

For Students 9th - 10th Standards
Very good site with links to reviews of various angles.
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Activity
Texas Instruments

Texas Instruments: What's the Trig?

For Teachers 9th - 10th Standards
Students will be introduced to right triangle trigonometry. They will use the TI-89 and Geometer's Sketchpad to construct a right triangle and calculate sin, cosine, and tangent of various acute angles.