Question

can someone help me with this

http://prntscr.com/2nnfv2

Answer 1

angles on a plane have to add to 180 degrees.
Full circle is 360 degrees. So think about that.

Answer 2

<EGF=<BGC=60
<AGC= <AGB + <BGC=90
<AGB+60=90
<AGB=30
hence proved

Answer 3

good good @rameshrajn just tell him the answer.
Heaven forbid we make people think.