The parameter of a square is equal to the perimeter of a rectangle of length 4 cm and breadth 2 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 one:
A) 4.51	B) 4.71	C) 4.32	D) 4.21	E) 4.68
Let the side of the square be a cm.   Parameter of the rectangle = 2(4+ 2) = 12 cm Parameter of the square = 12 cm   i.e. 4a = 12   a = 3   Diameter of the semicircle = 3 cm   Circimference of the semicircle   = 1/2(âˆ)(3)   = 1/2(22/7)(3) = 66/14 = 4.71 cm to two decimal places   Answer: 4.71
<result>B</result>
The parameter of a square is equal to the perimeter of a rectangle of length 4 cm and breadth 2 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)?