Blocks and a cylinder

This task is about calculating the volume of blocks in a cylinder.
Anaru packed three blocks into a cylinder, one block on top of the other.

a)
Find the total volume of the three blocks each measuring 4 cm × 3 cm × 3 cm.
 
__________ cm³
 
b)
Find the volume of the cylinder which has a diameter of 5 cm and a height of 9 cm. 
(Take = 3.14)
 
__________ cm³
 
c) How much empty space is left around the blocks? __________ cm³

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