The parameter of a square is equal to the perimeter of a rectangle of length 9 cm and breadth 6 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)? Pick:
A) 11.72 B) 11.52 C) 11.97 D) 10.91 E) 11.79
Let the side of the square be a cm.   Parameter of the rectangle = 2(9 + 6) = 30 cm Parameter of the square = 30 cm   i.e. 4a = 30   a = 7.5   Diameter of the semicircle = 7.5 cm   Circimference of the semicircle   = 1/2(âˆ)(7.5)   = 1/2(22/7)(7.5) = 165/14 = 11.79 cm to two decimal places   Answer: 11.79
<result>E</result>
The parameter of a square is equal to the perimeter of a rectangle of length 9 cm and breadth 6 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)?