Question

please help me do this question

Answer 1

$volume \: of \: earth = volume \: of \: embankment \\ \pi \times {( \frac{14}{2} )}^{2} \times 12 = \pi( {14}^{2} - {7}^{2} )h \\ {7}^{2} \times 12 = {7}^{2} ( {2}^{2} - 1)h \\ 12 = 3h \\ h = 4m$

Answer 2

it may be your answer