solve it please $3.$ Point A lies in the middle of a clayey sand layer with thickness $\backslash (=10\backslash$mathrm$\{$~m$\},\backslash$phi$^\{\backslash$prime$\}=38,$ c$^\{\backslash$prime$\}=10\backslash )$ kPa $,$ and $\backslash (\backslash$mathrm$\{$K$\}\_\{\backslash$mathrm$\{$o$\}\}=0\mathrm{.}5\backslash ).$ The ground surface is flat. The site is saturated.

a$.$ Use a compass to draw the MC for point A on the space shown on the right.

b$.$ Use a protractor and a ruler or red id to draw the failure envelope of the soil.

c$.$ A planned construction operation will cause the vertical effective stress at point $\backslash ($ A $\backslash )$ to rise to $80$ kPa $.$ The horizontal effective stress will remain unchanged. Will point A reach failure due to the planned construction operation?