∠AEC=180-∠EAC-∠ECA
=180-(∠EAC+∠ECA)
=180-(∠DAC+∠FCA)/2
=180-(∠DAC+∠FCA)/2
=180-(360-∠BAC-∠BCA)/2
=(∠BAC+∠BCA)/2
=(180-∠ABC)/2
=(180-47)/2
=66.5
∠AEC=180-∠EAC-∠ECA
=180-(∠EAC+∠ECA)
=180-(∠DAC+∠FCA)/2
=180-(∠DAC+∠FCA)/2
=180-(360-∠BAC-∠BCA)/2
=(∠BAC+∠BCA)/2
=(180-∠ABC)/2
=(180-47)/2
=66.5