90 degrees

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how to derive and memorize the trigonometric ratios of the special angles, how to use the trig ratios of the special angles to find exact values of expressions involving sine, cosine and tangent values of 0, 30, 45, 60 and 90 degrees, How to find sin, cos, tan, cot, csc, and sec of the special angles, and multiples of 90, How to remember special angles, Grade 9 math, with video lessons, examples and step-by-step solutions.

Often times, you are required to construct some angles without using a protractor. This article teaches you how to draw a 90 degrees angle using a compass and a ruler. Mark the vertex of your angle anywhere on the paper. Let us name this...

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Please give me feedback on the comment. Thanks a lot!! Mrs. Lin These are the two most common right triangles. For 45-45-90 degrees, the ratio is 1 - 1 - √ 2 For 30-60-90 degrees, the ratio is 1 - √ 3 - 2 Other concepts to remember are that in any triangle a. larger angle corresponds to longer side and b.same angles have the same side length. Level 0 skills check practices: Find the missing side length (answers below) I: 45-45-90 degrees right triangle a. 3 - ___- ___ b. 5 - ___- ___ c. √ 2…

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