a$)$ For the center point $A,$ determine the stress induced by the single circular loading at the depth of $2m$ and $4m.$

b$)$ For the edge point $B,$ determine the stress induced by the single circular loading at the depth of $4m.$

c$)$ Another similar circular foundation shown in the dashed line is built and loaded with uniform pressure of $1000$kPa. For the edge point $B,$ determine the stress induced by the two circular loadings at the depth of $4m.$

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