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If the sides of a triangle are produced ...

If the sides of a triangle are produced in order, prove that the sum of the exterior angles so formed is equal to four right angles.

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`angleACD=angleA+angleB,angleBAE=angleB+angleCandangleCBF=angleC+angleA`.
`:.angleACD+angleBAE+angleCBF=2(angleA+angleB+angleC)=(2xx180^(@))=360^(@)`.
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