The angle ABC is adjacent to the angle ABD, the sum of which is 180, then the angle ABC = (180 – ABD) = (180 – 150) = 30.
The AC leg lies opposite an angle of 30, then its length is equal to half the length of the hypotenuse AB.
AC = AB / 2.
By condition, AC + AB = 12 cm, then AB / 2 + AB = 12.
1.5 * AB = 12 cm.
AB = 12 / 1.5 = 8 cm.
Answer: The length of the hypotenuse AB is 8 cm.
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