Answer :

In rhombus ABCD

ACB = 40° given

ACB = CAD = 40° [Altermate interior angles are equal]


AOD = 90° [In rhombus diagonals bisect eact other at right angles]

AOD + CAD +ADB = 180° [Angle sum property of a triangle]

90° + 40° + ADB = 180°

ADB = 180°-130°

ADB = 50°

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