First angle is interpretted by the drawing being positioned to the right of the section and third angle is interpretted by the elevation being positioned to the left of the section.
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First angle=X Second angle=4x Third angle=5X-45 Since the angles of a triangle always = 180o x+(4X)+(5X-45)=180o 10X-45=180 10X=225 X=22.5 Therefore. . . First Angle=X=22.5o Second Angle=4X=90o Third Angle=5X-45=67.5o
100.
The angles are 40, 80 and 60 degrees.
180- total of the first two angles= 3rd angle
Angle 1 = 30 degrees Angle 2 = 50 degrees Angle 3 = 100 degrees.