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Option (ii) is Right
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Step-by-step explanation:
angle CDB = 90°. ( CD perpendicular to AB)
angle CDB = angle CDE + angleEDB = 90°
angle CDE + angleEDB = 90°
x + 2x - 15 = 90
3x - 15 = 90
3x = 105
x = 35
i) angle CDE = x = 35
ii) angle BDE = 2x-15 = 2×35 - 15 = 70-15 = 55
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