Question

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Answer 1

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Answer 2

$\huge\mathfrak\red {Answer:}$

<d + <a + <e = 180° (linear pair) ---- 1

<d = <b (Alternate interior angles of parallel lines) ---- 2

<e = <c (Alternate interior angles of parallel Iines) ---- 3

Let's replace <d with <b in Equation no. 1 as per the second equation.

Let's also replace <e with <c in Equation no. 1 as per the third equation.

→ <a + <b + <c = 180°

Hence proved.

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