The section of a tunnel, perpendicular to its
length is trapesium ABCD in which AB = 8 m,
Demand AL-BM The height of the tunnel is 2-4
and its length is 40 m
Find the cost of paving the floor of the tunnel at
16 per m
c) the cost of painting the internal surface of
the tunnel, excluding the floor at the rate of
5 per m
Rint. Are of the floor (40 x 8) m?
DAD VALDE-+(24) - 6 76 -2 6 m.
Area of internal surface = 12 (40 x 2-6) + (40 * 6) = 448 mºj
Surface Are of Solis
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