Here is a tunnel for a toy train.
The diagram below shows the
cross section of the tunnel.
A
2 cm
B
MathsWatch Ltd
8 cm
2 cm
10 cm
AD is a semicircular arc of radius 10 cm
BC is a semicircular arc of radius 8 cm
The length of the tunnel is 30 cm
Work out the total area of
all six faces of the tunnel.
Give your answer in terms of .
I
Total marks: 5
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