∠ACD=∠A+∠ABC
∠A`CD=∠A`+∠A`BC
Available:
∠A=∠ACD-∠ABC
∠A`=∠A`CD-∠A`BC
=∠ACD/2-∠ABC/2
=(∠ACD-∠ABC)/2
=∠A/2
=35
The quantitative relationship between ∠A and ∠ A' is as follows:
∠A=2∠A '