6. Prove that the line joining the mid points of the two parallel chords on the both sides of the centre of a circle passes through the centre. (4) 7. Some PWD workers were constructing a road using a road roller. The 1 m long road roller is made of iron. Its inner diameter was 54 cm and the thickness was 9cm.
(i) Find the outer curved surface area of the road roller. (2) (ii) If they can construct 1584 m2road in a day, find the revolutions that the road roller made. (2)
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