(1) You have to measure it yourself.

(2) The former figure is half of the paper of the latter figure, and the original length becomes the current width.

Activity 2

(1) Length: 4 times root number 3, width: 2 times root number 3, height: root number 3.

(2) The surface area is 84

(3)24 times the root number 3

20、p =(a+b+c)/2 = 15/2 = 7.5； So the formula is s= radical sign (7.5*(7.5-5)*(7.5-4)*(7.5-6)) about 9.92.

That's the end of my answer, thank you.

I hope my answer is helpful to you.