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!!!

Re: Using trigonometry to measure visual angles

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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 $\displaystyle \boxed{\tan^{-1}}$-button.

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