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Answer

Red triangle

∠a + ∠c = 180º – (72º + 21º) = 87º

Green triangle

∠b + ∠d = 180º – (21º + 50º) = 109º

 

∠a + ∠b + ∠c + ∠d = 87º + 109º = 196º

 

What your child wrote on the paper is correct.

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Yes. Thanks 

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