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First Four Postulates

In figure giv...

Question

In figure given, if AC $=$ BD, show that AB $=$ CD. State the Euclid's postulate/axiom used for the same.

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Solution

$A C = B D$
If two lines are collinear then they are equal.(By euclid axiom)
$A B + B C = B C + C D$
$A B = C D$

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