The aspect ratio

The aspect ratio of the rectangular triangle is 13: 12: 5. Calculate the internal angles of the triangle.

Correct result:

A =  90 °
B =  67.38 °
C =  22.62 °

Solution:

$\sin B=\dfrac{ b }{ a }=\dfrac{ 12x }{ 13x } \ \\ \ \\ B=\dfrac{ 180^\circ }{ \pi } \cdot \arcsin(12/13)=67.38 ^\circ =67^\circ 22'49"$
$C=90-B=90-67.3801=\dfrac{ 1131 }{ 50 }=22.62 ^\circ =22^\circ 37'12"$

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