CAT 2018 Slot 2 QA Q6 Mensuration

Question 6 of the Quantitative Ability (QA) section, CAT 2018 Slot 2, with CAT's official answer.

From a rectangle ABCD of area 768 sq cm, a semicircular part with diameter AB and area 72π sq cm is removed. The perimeter of the leftover portion, in cm, is
  1. A
    88 + 12π
  2. B
    80 + 16π
  3. C
    86 + 8π
  4. D
    82 + 24π

Answer: (A) 88 + 12π Mensuration MCQ

A worked solution for this question is being written. Meanwhile, practise it in a timed mock and see how other aspirants did.