Question

Determine the ink of the ABC quadrilateral in the figure

from the picture. ​

Answer 1

angle A =90° so angleC=90°

in triangle dbc

(db)^2=(cb)^2+(dc)^2

db^2=8^2+17^2

db^2=353

db=√353

db=18.7cm

in triangle adb

(db)^2=da^2+ab^2

(18)^2=9^2+ab^2

324-81=ab^2

243=ab^2

ab=√243

ab=15.58 cm