What is the value of x?

A triangle has one angle measuring 3x, second angle is 2x=20, third measures 4x-20. How do I set this up and how do I find the value of x?

How can I solve this, thorough description pleae?
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1 Answer

3x + ( 2x + 20 ) +(4x - 20) = 180

angle 1 + angle 2 + angle 3 = 180

9x = 180

x = 180/9

x = 20 degree

by Level 8 User (36.8k points)

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