Answer: v = u= 
Step-by-step explanation:
v= cos45 * 4= 
- Apply Pythagorean theorem
= 
We have u = 
Answer:
Use this formula for these kinda things.
Step-by-step explanation:
Remember The z is the hypathonous, it means the biggest side.

where Z is going to be C
put this all together

put it into calculator, means 373=

therfore take the square root, it will be

which it will be 19.31
Answer:
Step-by-step explanation:
if it is (4)^(1/4) ft.

if it is (4^1)/4
then

If it's a regular octahedron, then you can calculate it using the formula

where

is the length of the edge.
If it's not regular, you have to calculate the area of each side individually.
Well 7/2=3.5 so i would say 3/1/2 i believe