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Sum of which two angles is 180° in each figure ?

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Sum of which two angles is 180° in each figure ?

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From above question, 

i) ∠1 + ∠2 = 180° 

∠2 + ∠3 = 180° 

∠1 + ∠4 = 180° 

∠3 + ∠4 = 180°

∠5 + ∠6 = 180° 

∠6 + ∠7 = 180° 

∠7 + ∠8 = 180° 

∠5 + ∠8 = 180°

∠1 + ∠8 = 180° 

∠4 + ∠5 = 180° 

∠2 + ∠7 = 180° 

∠3 + ∠6 = 180°

ii) ∠a + ∠b = 180° 

∠b + ∠c = 180° 

∠c + ∠d = 180° 

∠a + ∠d = 180° 

∠e + ∠f = 180° 

∠f + ∠g = 180° 

∠g + ∠h = 180° 

∠e + ∠h = 180°

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