It means to be perpendicular, and then there's these teacher's comments that we can move around.
Three different students attempt definitions of what
"Can you match the teacher'sĬomments to the definitions?" All right. "Three students attempt "to define what it means for lines l and m "to be perpendicular. And so, to get some practice being precise and exact with our language, I'm going to go through some exercises from the Geometric Definitions Exercise on Khan Academy. Things about the world, we have to be very careful, very precise, very exact with our language so that we know what we're proving and we know what we're assuming and what type of deductions we are making as we prove things. What geometry is about is proving things about the world.
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