15 cm long and 5 cm wide is pretty nearly 15 cm long.
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5cm * 5cm * 10cm = 250 cm3
The volume of a region of space with those dimensions is 15 x 8 x 5 = 600 cubic centimeters, regardless of what's in it. Even if it's empty.
it is about 5cm long and 3cm wide
V = 10cm * 6cm * 5cm = 300cm3
Well, assuming it doesn't have any other sides, it's a scalene triangle.