Question 5
The diagram below shows ten circles each of radius $1$ cm long. The four circles in the front row are tangent to their neighbours and their centres lie on the same line. For each of the six circles behind, the top semicircle runs between the highest points of two circles in the row in front. Calculate the area, in cm$^2$, of the figure excluding the four circles in the front row. You may make take $\pi$ to be $3.14$.
