Maths~~~ pls answer, thanks

(i)

the radius for the big circle = 7cm,

therefore, the circumference of big circle = 2 x r x pi = 2 x 7 x 3.14 = 43.96 cm


(ii)

the radius of the string = 1/2 x 7cm = 3.5cm

the lenght of the string = circumference of small circle = 2 x 3.5 x 3.14 = 21.98 cm


so, the percentage of circumference of big circle to the string is 43.96/21.98 x 100% = 200%