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Prove 21 and 24 are supplementary. Move options to the boxes to complete the proof.

Prove 21 and 24 are supplementary. Move options to the boxes to complete the proof-example-1
User Mystery
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Answer:

angle 1 and angle 4 are supplementary because it is exterior alternate angle and sum of alternate exterior angle is always 180 degree(supplementary)

Explanation:

User Ztsv
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