Answer:
Erm. If you know pie use it with the 3.141 Since its a half circle i believe you need that since thats the equasion with it. I don't really know :P
Step-by-step explanation:
Answer:
2.62
Step-by-step explanation:

First, write the square root as exponent.

Move the denominator to the numerator and negate the exponent.

Use log product property.

Use log exponent property.

Substitute values.

As written, it is interpreted to mean 14·22·350·x = 107800x.
_____
Often such an expression written here on Brainly is expected to be interpreted as an exponential expression: 
Step-by-step explanation:
Area of the octagon = 2(1+√2)8=309.02 units