Basic Trigonometry

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This resource contains two interactive excel files dealing with trigonometry in right angled triangles. Each interactive file has the same further 13 sheets of questions which may be suitable for use in the classroom.

Trigonometry: Finding LENGTHS
The first three sheets help students to identify the hypotenuse and the opposite and adjacent sides. Sine, cosine and tangent ratios are defined and shown on diagrams. The next sheet reminds students how to rearrange formulae in the form A=B/C in preparation for rearranging the equations involving the trigonometric ratios. The remaining sheets pose problems where students need to calculate lengths given another side and an angle. Answers can be revealed and new questions generated. The final interactive sheet requires students to find either lengths or angles using trigonometry.

Trigonometry: Finding ANGLES
This Excel file begins with two sheets which remind students of the names of the sides of a right angle triangle and the sine, cosine and tangent ratios. The next three interactive sheets each show triangles which have a horizontal and a vertical side. Given two of the sides students need to calculate the smaller and the larger angles in the triangle. Answers can be revealed and new questions generated.

This program was designed by be viewed on a screen with a resolution of 1024 x 768. Users may have to adjust the resolution of their screen for the pages to display as was originally intended. The program uses macros which need to be enabled on users' machines.

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