Geometry

Hong Kong

Stage 1 - Stage 3

Are the lines $AB$`A``B` and $CD$`C``D` parallel?

Yes

A

We need more information.

B

No

C

Easy

Less than a minute

Are the lines $AB$`A``B` and $CD$`C``D` parallel?

Consider the following image:

Are the lines $AB$`A``B` and $CD$`C``D` parallel?

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