Well, in order to prove the Pythagorean theorem, every triangle you are using has to have one right angle (90-degree angle), and the side opposite to it will be called the hypothenuse. The remaining two triangles will be acute angles (<90 degrees), and the sides opposite to them are called sides/catheti.
The answer is 8.71.
In order to find the value of any logarithmic function, you can raise the base (10 by default, unless stated otherwise) to the answer (.94) to get the number (x).
So, 0.94 = log x is basically saying 10^.94 = x. And when you raise 10 to the .94 power, you get 8.71.
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