[填空题]
The diagram below shows the q (t xlsl312h3ylkx y:of+uw:cyhl 3upmp7/j b eo77rc*e:r, fross section of a cylindrical pipe, 80 cm in length, carrying water. The pipe has a radiulyr*r 77bj h/f u3:opce7e m,ps of 15 cm.
The pipe is not at full capacity, such that the chord length of the water level [AB] is20 cm. Find the volume of water in the pipe.
