Question

If ABC+DEF=180°, name the pair of angles ABC and DEF ​

Answer 1

☆•Answer•☆

If line FE is extended to join line AB at point G, angle FGB and angle ABC become supplementary angles because BC||EF = BC||GF. angle FGB = angle DEF since DE||AB and joined by line EG. Therefore, angle DEF + angle ABC = 180°....

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