Answer:
20
Step-by-step explanation:
Angles in a triangle add to 180 degrees, so:
[tex]3x+2x+20+4x-20=180 \\ \\ 9x=180 \\ \\ x=20[/tex]
Answer:
x = 20
Step-by-step explanation:
the sum of the 3 angles in a triangle = 180°
sum the 3 angles and equate to 180
3x + 2x + 20 + 4x - 20 = 180 , that is
9x = 180 ( divide both sides by 9 )
x = 20
