I keep getting the same result over and over again. It seems correct but it's not. The reason I calculated the decimal is because the answer is in decimals so I thought to try that. Real solution is 15.2 so I still might be right but idk.
The problem is
The volume of a straight regular octagonal prism is equal to 8 cm3, and its height is sqrt2 + 1 cm. Calculate the area of the mantle.
Here is my line of thinking. I need a, so in order to calculate that, I'll use height hb and b since I can calculate both using sin45 and phytagoras. I got a, looks weird. I got M, looks weirder.
Help
The problem is
The volume of a straight regular octagonal prism is equal to 8 cm3, and its height is sqrt2 + 1 cm. Calculate the area of the mantle.
Here is my line of thinking. I need a, so in order to calculate that, I'll use height hb and b since I can calculate both using sin45 and phytagoras. I got a, looks weird. I got M, looks weirder.
Help