How many pairs of perpendicular lines are there in the diagram below?
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How many pairs of perpendicular lines are there in the diagram below?
Remember that perpendicular lines are lines that intersect at a right angle of 90 degrees.
Our right angles are:
The lines that form angle ABC are: AB+BC
The lines that form angle BCD are: BC+CD
The lines that form angle CDE are: CD+DE
The lines that form angle DEF are: DE+EF
The lines that form angle EFG are: EF+FG
The lines that form angle FGH are: FG+GH
The lines that form angle GHI are: GH+HI
The lines that form angle HIJ are: HI+IJ
The lines that form angle IJK are: IJ+JK
The lines that form angle JKL are: JK+KL
The lines that form angle KLA are: KL+LA
The lines that form angle LAB are: LA+AB
Due to the fact that in the drawing we have 12 angles of 90 degrees marked, we must have 12 pairs of perpendicular lines.
12
What do the four figures below have in common?
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