Euler's formula for a polyhedron is given by:

Make E, the subject of the formula:

Put F = 20, V = 12, to obtain E,

Therefore, there are 30 edges
The answer would be 114. I did 3 times 38 and thats what i got. I hope it helps:D This is from your friendly Tolkien fan.
Answer:
113.04 km²
Step-by-step explanation:
Formula - Area = πr²
= 3.14 * 6²
= 113.04 km²
Answer:
A.
Step-by-step explanation:
Because they are both subtracting, both lines have to go to the left
Answer:
8.778 or 8.8
Step-by-step explanation:
20% of 43.89 is 8.778
math: 43.89*(20/100) = 8.778