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प्रश्न
ABCD is a rectangle with ∠ABD = 40°. Determine ∠DBC .
उत्तर
We have,
`∠`ABC = 90°
⇒ `∠`ABD + `∠`DBC = 90° [ ∵ `∠`ABD = 40°]
⇒ 40° + `∠`DBC = 90°
∴`∠`DBC = 50°
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