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प्रश्न
In square ABCD, E is a point on CD such that ∠BEC = 60°. Find ∠DBE.

बेरीज
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उत्तर
Given,
In the square ABCD, E is a point on CD such that ∠BEC = 60°.

We know the internal measure of a triangle is 180°
⇒ ∠E + ∠C + x = 180°
⇒ 60° + 90° + x = 180°
⇒ x = 180° – 150°
⇒ x = 30°
And the diagonal line divides the right angle into two equal halves,
⇒ x° + ∠DBE = 45°
⇒ ∠DBE = 45° – 30° = 15°
Hence, this is required.
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