Question

please explain briefly and as soon as possible
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Answer 1

Answer:

Here is your solution.. Thanks

Answer 2

Let ∠ a = ∠x + ∠y

⇒∠x = 25 ° (Alternate angles)

⇒∠y = 65° (Alternate angles)

∴ ∠ a = 25° + 65°

∠ a.= 90°