Question

The diagram shows a semi-circle inside a rectangle of length 140 m. The semi-circle touches the rectangle at P, Q and R. Calculate the perimeter of the shaded region. Give your answer correct to 3 significant figures. ​

Answer 1

Answer:249.97

now unfortunately this is only 4 marks out of 5 i don't really know I cant solve the other mark but essentially you do 1/4x(2πr) then input those values, and then add 140 since there are 2 radiuses which are 70m each, then 439.88x1/4=109.97+140=249.97