Question

2. In rhombus
ABCD if angle ACB= 50° then angle ADB=?
(A) 40°
(B) 80°
(C) 50°
(D) 100°​

Answer 1

Answer:

c) 50°

Step-by-step explanation:

all angles of rhombus are equal

Answer 2

Answer:

AD | | BC ∴ ∠CAD = ∠ACB = 50° [alt . int. ∠S]

∵ The diagonals of a rhombus are at right angle to each other .

∴ ∠AOD = 90°

Now , in △AOD , we have

∠ADO + ∠DAO + ∠AOD = 180°

⇒ ∠ADO + 50° + 90° = 180°

⇒ ∠ADO + 140° = 180°

⇒ ∠ADO or ∠ADB = 40°