Acannery packs tuna into a metal can with a diameter of 6.8 cm and a height of 4.0 cm. about how many square centimeters of metal are used to make each can? round your answer to the nearest tenth if necessary. a. about 162.8 cm2 c. about 128.7 cm2 b. about 68.9 cm2 d. about 158.0 cm2

  About 158.0 cm²

Step-by-step explanation:

The total area is the sum of the areas of the two identical circular ends and the lateral area.

  total area = 2×(end area) + (lateral area)

  = 2×π(3.4 cm)² + π(6.8 cm)(4 cm)

  = (23.12π +27.2π) cm² = 50.32π cm²

  ≈ 158.0849 cm² ≈ 158.1 cm²

You get the incorrect answer 158.0 cm² if you use the inappropriate value 3.14 for π. 3.14 is inappropriate because it is a 3-significant-digit number and the answer is desired to 4 significant digits. A value of π good to 4 or 5 significant digits should be used to obtain the desired result.

answer: true

step-by-step explanation:

step-by-step explanation: