<PRE><B>Question 912165</B>
Angles of a triangle add up to 180.
A + B + C = 180
B = 2A
C = 3A
A + B + C = 180
A + (2A) + (3A) = 180
6A = 180
A = 30
If A (the smallest angle) is 30, then B is 60 and C is 90.
30 + 60 + 90 = 180</PRE>