The parameter of a square is equal to the perimeter of a rectangle of length 24 cm and breadth 16 cm. Find the circumference of a semicircle whose diameter is equal to the side of the square. (Round off your answer to two decimal places) Answers:
A) 77.14 cm
B) 47.14 cm
C) 84.92 cm
D) 94.94 cm
E) 31.42 cm

Rationale: "let the side of the square be a cm . parameter of the rectangle = 2 ( 24 + 16 ) = 80 cm parameter of the square = 80 cm i . e . 4 a = 80 a = 20 diameter of the semicircle = 20 cm circimference of the semicircle = 1 / 2 ( ∏ ) ( 20 ) = 1 / 2 ( 22 / 7 ) ( 20 ) = 440 / 14 = 31.42 cm to two decimal places answer : e"
Answer: E