Question

find how much steel was actually used if 1/12 of steel actually wasted in making the tank if diameter and height of tank is 4.2 and 4 .5

Answer 1

Answer:

79.92 units²

Step-by-step explanation:

Find the radius:

Radius = 4.2 ÷ 2 = 2.1 unit

Find the surface area of the open tank:

Surface area = πr² + 2πrh

Surface area = π(2.1)² + 2π(2.1)(4.5) = 73.26 units²

Find the actual steel used:

1/12 of the steel is wasted

Therefore 1 - 1/12 = 11/12 is used

11/12 = 73.26 units²

1/12 = 73.26 ÷ 11 =  6.66 units²

12/12 = 6.6 x 12 = 79.92 units²

Answer: The actual amount of steel used is 79.92 units²

Answer 2

Answer:

79.92 is the answer....