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Here is a tunnel for a toy train.
The diagram below shows the cross section of the tunnel.
A
3cm
B
7cm
AD is a semicircular arc of radius 10 cm
BC is a semicircular arc of radius 7 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 .
C
10cm
3cm
Not drawn
accurately
D
[5 marks]

18 Here is a tunnel for a toy train. The diagram below shows the cross section of the tunnel. A 3cm B 7cm AD is a semicircular arc of radius 10 cm BC is a semic class=

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