A stone tunnel is to be constructed such that the opening is a semielliptic arch, as shown in Figure 15.45. It is necessary to know the height at 4 -ft intervals from the center. That is, how high is the tunnel at \(4,8,12,16\), and \(20 \mathrm{ft}\) from the center? (Answer to the nearest tenth of a foot.)

Figure 15.45

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15 ft 40 ft