1 Answer

Jeff Goldberg · Answer 1 · 2019-05-18T17:01:14+0000

Set an equation equal to 180° with angles A,B and C

140x-14+29-2x+9+x=180

Then combine like terms

39x+24=180

Subtract 24 from 180

39x=156

Divide by 39

x=4

Plug in 4 for x in the equations of angles A, B, and C

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