# Perpendicular Shapes For Kids

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(The little box drawn in the corner, means "at right angles",
so we didn't really need to * also* show that it was 90°,
but we just wanted to!)

May 2016 - Two lines are perpendicular if they cross at right angles . You can test this by extending the lines until they cross (if they do not cross then they are parallel ). Where the two lines cross, draw a right triangle , and then see whether the triangle conforms to the Pythagorean Theorem - if so, then your lines are crossing at a right angle, and they are perpendicular.

What is the best way to specify a line? In this case we want to work with finite length so a good way to specify the line is by its end points. In order to find the intersection of lines we need to convert this to the equation of the line: y = a*x + b as follows: