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Low accuracy (4 of 18 factors)

I've been studying trigonometry, and I keep hearing about SOHCAHTOA. I'm wondering how I can use those ratios on a calculator to find the correct values in trig problems. If someone has advice or tips, it'd be greatly appreciated. Thanks!

6 months ago

SOHCAHTOA is a helpful mnemonic device to remember the three basic trigonometric ratios related to right triangles:

- SOH: Sine (sin) = Opposite side length / Hypotenuse side length

- CAH: Cosine (cos) = Adjacent side length / Hypotenuse side length

- TOA: Tangent (tan) = Opposite side length / Adjacent side length

To use SOHCAHTOA on a calculator, you need to know the angle you're working with and the lengths of the sides of the triangle. Here's a step-by-step guide on how to use SOHCAHTOA with a calculator:

1. Determine which trigonometric ratio (sin, cos, or tan) you need to use based on the given angle and side lengths in the problem.

2. Make sure your calculator is in degree mode (deg) if the angle is given in degrees or radian mode (rad) if the angle is given in radians. You can usually switch between modes using the "Mode" or "DRG" button on your calculator.

3. Enter the angle value on your calculator.

4. Press the appropriate trigonometric function key. For example, if you're using the sine ratio, press the "sin" key, which is usually available without using the shift or second function key.

5. Press "=" or "Enter" to get the result.

If you're looking for the angle instead of the side length, follow these steps:

1. Determine which trigonometric ratio is relevant based on the provided side lengths.

2. Divide the side lengths as required by the ratio (opposite/hypotenuse for sin; adjacent/hypotenuse for cos; or opposite/adjacent for tan).

3. Make sure your calculator is in the correct angle mode (degrees or radians).

4. Use the inverse trigonometric function key on your calculator (sin^-1, cos^-1, or tan^-1). These functions are typically accessed using the shift or second function key followed by the "sin", "cos", or "tan" button.

5. Enter the result of your division into the calculator.

6. Press "=" or "Enter" to get the result, which will be the angle's value.

Make sure to carefully analyze the problem and select the appropriate trigonometric ratio to use based on the given information. Practice and familiarity with this process will make solving trigonometry problems with SOHCAHTOA much smoother. Good luck!

6 months ago

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