K=2. You have to divide 3.2 by 4, then divide both sides by 0.8, finally, you have your answer, K=2.
Answer:
Area of semicircle is

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there are the ways to reach that are conduction,convection and radiation
A octagon has 8 sides and one side is = 20inches ,so 20*8 is equal to 160 so all the sides together is 160 inches
Just transpose the 5 to the right side of 18 so it will look like this, /x/ = 18 - 5
Then get the difference and it would be 13. So to check this out if it is correct, substitute x for the value of 13 and it will look like this.
13 + 5 = 18
I hope my answer helped you.