![]() The quadrilateral, or let's reflect the points Let's see if we canĭraw this quadrilateral. So this is my best attemptĪt drawing that line. Through that point and just keeps going on and on. And we keep going atĪ slope of negative 2. Every time we increase by 1- orĮvery time we increase x by 1, we decrease y by 2. The quadrilateral is left unchanged by reflection ![]() It a little bit thicker now, now that I've dotted it out. Or when x increases byĢ, y will increase by 1. Every time x increases byġ, y will increase by 1/2. Is left unchanged by a reflection over the Love Khan Maths program - life changingĪ certain quadrilateral are negative 4 comma negative 2. How do people know this? Using what formula did they arrive at this answer? Have I missed a video? Intro to rotational symmetry doesn't answer any of these questions and certainly doesn't give sufficient examples.Īlso, on the same practice test, they ask if lines dividing a given geometric figure do so in such a way that creates symmetry and some questions you can eyeball but some are very precise and only off by a slight margin and in the answers it just shows arrows - how do they decide the slope of these arrows to ensure symmetry? How should I do this at home? Should I be calculating the slope of each line segment to ensure all slopes are identical? And if so, was this in a video that I missed somewhere? Performing the rotation brings the starting point to (−9,1) The quadrilateral has rotational symmetry of 90∘ degrees about the point (−4,−4) One of the points that defines a certain quadrilateral is (1,1). There isn't a comprehensive video on rotational symmetry and no space to ask on the practice tests but the test question reads:
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