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Theorem 6.7 : The sum of the angles of a...

Theorem 6.7 : The sum of the angles of a triangle is 180º

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Since `l∥BC`.
Therefore,
`/_2=/_4` ......eq(i)
And, `/_3=/_5`......eq(ii)
adding eq(i)and(ii)
`/_2+ /_ 3=/_ 4+/_5`
...
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