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An isosceles trapezium ABCD with sides 
is given:
Prove the height of the trapezium measures 
. Calculate the volume of an upright prism with height 
, which has the trapezium ABCD as its base.
Calculate the area of the trapezium 
obtained by the central extension of the trapezium 
. The stretch has its centre at the point A and the factor 
.
The trapezium ABCD rotates around its bisector for 
. Calculate the area and volume of the resulting revolution.
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