If I am not wrong you would multiply 90 times .2 to get that answer... If so the answer should be 450 kilometers
Answer:

Step-by-step explanation:
Formula for the perimeter of a rectangle: 
Answer:
105
For the 4 triangular faces, find the area with 1/2 × base × height = 1/2 × 5 × 8 = 20
4 triangles -> 20 × 4 = 80
The area of the square base is 25
80 + 25 - 105 
Answer:
x=21
Step-by-step explanation:
x=9+12 x=21