Question

A triangle has one angle measuring 3x degreees a second angle of 2x + 20 degrees and the third angle measures 4x -20 degrees what is the value of x

Answer 1

x = 20

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

Answer 2

20

Explanation:

Angles in a triangle add to 180 degrees, so:

`3x+2x+20+4x-20=180 \\ \\ 9x=180 \\ \\ x=20`