$8\mathrm{.}4$ kNm torque is applied to a $3$ m long steel angle with a $200mm200mm10mm$ cross section. From tabulated properties for 'equal angles', the gross cross sectional area of the section is $5090m{m}^2.$ Knowing that $G=77$GPa, determine $($a$)$ the maximum shearing stress along line $m-m.$ Provide your answer in Mpa with precision to two decimal points.

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Solve the problem using the equations provided for open thin$-$walled sections.

The correct answer is: $640\mathrm{.}24$

Determine the angle of of twist if $4\mathrm{.}2$ kNm of torque is applied to the above long angle steel. Provide your answer in Degrees with precision to two decimal points.

Answer: $0\mathrm{.}00883$

The correct answer is: $71\mathrm{.}46$