Answer these using a graph.

Given A series of direct shear tests was performed on a soil sample with each test carried until the soil specimen experienced shear failure. Test data are listed below. Required The soil's cohesion and angle of internal friction$\mathrm{.}3-1.$ A series of direct shear tests was performed on a soil

sample. Each test was carried out until the specimen

sheared $($failed$).$ The laboratory data for the tests are

tabulated as follows. Determine the soil's cohesion

and angle of internal friction.

The data shown in the following table were obtained

in triaxial compression tests of three identical soil

specimens. Find the soil's cohesion and angle of inter$-$

nal friction.