Question

find the value of unknown angle x ​

Answer 1

When we add 3 angles then the sum is 180 degrees
Sum of measure of angles is 180 degrees (property of triangle used in the sum)
So
2x + 3x + 4x = 180
9x = 180
X = 180/9
X = 20
So the value of x is 20 degrees

Answer 2

Answer:

sum all numbers of triangle= 9x then divide it by 180 (angle sum property) = 20 then multiply by 2x = 2* 20= 40 , 3x=60 ,4x=80 ok