calculator

7 trigonometric proportions to the calculator

There are many different units in which an angle is measured, with degrees being one of the options. Before using the calculatorto determine the trigonometric ratios of angles measured in degrees, you should ensure that the calculator is set to use the appropriate units.

Make sure it is your calculatoris making use of the correct system of angle measurement prior to using trigonometric ratios.

This calculatoris set to use degrees when the indicator for display is shown towards the front of the screen. If you see the display indicator as well it is, then you're calculator has been set up to utilize different measurements for measuring angles.Figure 9 The degrees setting

To change the settings of the calculator so that it works in degrees use the key sequence (SETUP) (Deg).

To determine the sine cosine, tangent or sine an angle, press , or key and enter the length of your angle. It is important to note that , and keys automatically create a bracket automatically for you. If you're only calculating the cosine, sine or tangent of an angle simply press after to enter the angle - there is no need to close the bracket. If you're using the ratios as part of the overall calculation and you are using them in conjunction with other calculations, then you'll need to remember to close the bracket by yourself (by pressing ) before entering your next calculation.

A few older models of calculator require that the angle be entered first, which is then followed by , or button.

The activity 16 is Trigonometric Rapports. You can find them on your calculator

Determine the value of each of these using your calculator Give your answers correct to 3 significant figures.

Answer the question

You'll notice from the answers to the question (3) it is that the calculator calculates the ratios for some angles as fractions, including surds if needed, and not in decimal format.

The decimal form can be found using or .Previous6.2 Inserting a missing rootNext8 Finding angles from trigonometric ratiosMU123_1PrintPrint

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