Question

someone please help me with number 8.

Answer 1

m∠DEG = 109

m∠GEF = 71

m∠DEG + m∠GEF = ∠DEF

Then you would substitute ∠DEG for 109 and ∠GEF for 71.

109 + 71 = m∠DEF

180 = m∠DEF

To solve this faster, I know that DEF is a supplementary angle and supplementary angles equal 180 degrees. So, m∠DEF would equal 180.

Hope this helps :))