Answer :

Answer:

  • 2.5 units

Step-by-step explanation:

The total surface area is

  • S = 2*(ab + bc ac)

Given

  • Sides are 6, 10 and a

Find the missing value

  • 200 = 2(6*10 + 6a + 10a)
  • 100 = 60 + 16a
  • 16a = 40
  • a = 40/16
  • a = 2.5