Question 678491
the sum of angles in a triangle add up to 180 degrees
let x=the first angle
the second angle=3x
the third angle=2x-12

x+3x+2x-12=180
6x-12=180
6x=192
x=32

answer: the first angle is 32 degrees

if you need the measurement of the other angles plug in x
second angle = 3x
3(32)
96

third angle is 2x-12
2(32)-12
64-12
52