Question 647413
Here it is drawn to scale:

{{{drawing(288,396,-1,7,-1,10, 

line(0,0,3.5,0), line(3.5,0,5.1823,6.2765), line(5.1823,6.2765,2.4218608,9.0388808), line(2.4218608,9.0388808,0,0),
locate(0,0,M),locate(3.5,0,I),locate(5.3,6.4,S),locate(2.35,9.6,T)
red(arc(0,0,2.5,-2.5,0,75)), locate(.3,.6,"75°"), red(arc(3.5,0,2.5,-2.5,75,180)), locate(2.7,.7,"105°"), locate(1.2,0,3.5cm),
locate(4.5,3.2,6.5cm), red(arc(5.1823,6.2785,2.5,-2.5,135,255)),
locate(4.2,6.35,"120°")

)}}}

Edwin</pre>