30 because AB=ACAB=BD ∠ABC=∠ACB ∠BAD=∠ADB because DA is perpendicular to AC ∠ BAC ∠ Bad = 90 because ABC = ∠ Bad ∠ ADB = 2. +080-4 ∠ ADB ∠ BAC = 90-∠ DAB = 90-∠ ADB, so 180-4 ∠ ADB = 90-∠ ADB.
From the meaning of the question, we can know that the ratio of hens to chicks is 1: 10, that is to say, hens account for1/kloc-0 =11/and chicks account for/kloc-0.