My picture is my question

<4 = 120

Step-by-step explanation:

You first need to set <1,<2, and <3 = to 180 since the area of a triangle = 180*

3x+4x+2x=180

9x=180

x=20

Next substitute 20 for x

3(20)=60

Then subtract 60 from 180 to find <4

120=<4

<1 and <4 are complimentary <s so they both add to 180, so we can use subtraction to find what <4 is = to.