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The first problem is a barrel, whose volume is the only thing I know about it and I gotta solve it's measurements. There is a tip that it is a square when looked far from the side of the barrel (both height and width are the same). I have no clue about this one..

The second is a long swimming pool and I need to calculate the volume of the water in the pool, although my drawing skills aren't the greatest, I try my best, so: the pool is 4,8 metres long, it's the size of a half circle and it's radius (r) is 0,18m and diameter is 0,36m. So I need to calculate a segment of the circle first but I don't know how to do that, so please help me?

Thank you in advance, and this time I read the description twice so I didn't miss anything relevant And also a 7 hour deadline on this :X

EDIT: The asnwers are as following: Problem one's measurements are 6,8m x 6,8m and the pool's volume is 96 liters, I just need to know how to get those results..