ABCD is a rectangle with ∠ABD = 40°. Determine ∠DBC

Question:

ABCD is a rectangle with ∠ABD = 40°. Determine ∠DBC

Solution:

We have,

∠ABC = 90°

⇒ ∠ABD + ∠DBC = 90° [∵ ∠ABD = 40°]

⇒ 400 + ∠DBC = 90°

∴ ∠DBC = 50°

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