# Question #f6d94

##### 1 Answer

#### Answer:

#### Explanation:

Here are 2 ways you could do this.

**Method 1: ...almost feels like cheating ;)**

If

use your calculator (or a spreadsheet) to evaluate:

which implies (after dividing by 2)

Then

use your calculator again to find

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

**Method 2: possibly more virtuous (???)**

If

then we can think of angle

The hypotenuse would be equal to

(and, yes, I did use a calculator to discover this).

Then, if we remember the double angle formula:

we can re-arrange the terms to get

and with the aid of my calculator (again)