Prove Proposition III-46: Under the same assumptions as in III-45. angle ACF – angle DCG and angle CDF – angle BDG (Fig.4.34).

Solution
Prove Proposition III-46: Under the same assumptions as in III-45. angle ACF =angle DCG and angle CDF =angle BDG (Fig.4.34).
Solution:
Consider bigger circle EHFC:
Chord EH is common for both the angle ECH and angle EFH.--------------------------------1
Since these two are the angle subtended by same...