# Using trigonometry to measure visual angles

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• October 21st 2011, 11:14 AM
Lilyas93
Using trigonometry to measure visual angles
Question 2a: Assume the tree is 10 m high and viewed from a distance of 30 m. Use Equation 1 to calculate the angle subtended by the tree at the eye? Express your answer in degrees to two decimal places (hint: the answer is near 20 degrees).

GO to the link and look at question 2A picture and equation
Visual Angles

Please help i am soo stuck!!!
• October 22nd 2011, 12:05 PM
earboth
Re: Using trigonometry to measure visual angles
Quote:

Originally Posted by Lilyas93
Question 2a: Assume the tree is 10 m high and viewed from a distance of 30 m. Use Equation 1 to calculate the angle subtended by the tree at the eye? Express your answer in degrees to two decimal places (hint: the answer is near 20 degrees).

GO to the link and look at question 2A picture and equation
Visual Angles

Please help i am soo stuck!!!

1. You know H = 10 m and D = 30 m. Plug in these values into the given formula. Calculate the ratio in brackets.

2. Now use your calculator and calculate the arctan value of this ratio. If you can't find the arctan-button on your calculator then use the $\boxed{\tan^{-1}}$-button.

3. Now multiply the result by 2 and you are done.