Two supplementary angles are in ratio 4 : 5, find the angles, 

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1 Answers

Let angles are 4x & 5x. 

∴ Angles are supplementary 

∴ 4x + 5x = 1800 

⇒ 9x = 1800 

⇒ x = 180o/9 = 20o 

∴ Angles are 4 × 200 , 5 × 200 ⇒ 800 & 1000 

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