In the figure given below, if ∠2 = 130°. Find ∠1.
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∵ ∠POR and ∠QOR form the linear pair.
=> ∠POR + ∠QOR = 180°
=> a + b = 180° …(1)
a – b = 80° …(2)
Adding Eqn. (1) & (2)
2a = 260 => a = 130°
From Eqn. (1)
130° + b = 180° => b = 50°
a = 130°, b = 50°
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