📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store

    • Question

      What is the area of a circle whose radius is equal to the

      length of a cube’s edge, if the cube's total surface area is 1,944 cm²? (Take π = 3)
      A 772 cm² Correct Answer Incorrect Answer
      B 972 cm² Correct Answer Incorrect Answer
      C 922 cm² Correct Answer Incorrect Answer
      D 572 cm² Correct Answer Incorrect Answer

      Solution

      ATQ,

      Total surface area of cube = 6 × edge²

      So, 6 × edge² = 1,944

      Or, edge² = 324

      Or, edge = ±18

      But edge cannot be negative.

      So, edge = 18 cm

      Area of circle = π × radius² = 3 × 18² = 3 × 324 = 972 cm²

      Practice Next

      Relevant for Exams:

      ask-question