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 November 13th, 2016, 09:56 PM #1 Newbie   Joined: Nov 2016 From: South Africa Posts: 6 Thanks: 0 Diagram of rhombus Rhombus diagram, Q(-8;6), R, S and T(3:9). The equation of QS is x+3y=10. Show that the equation of RT = 3x-y=0
 November 13th, 2016, 10:18 PM #2 Newbie   Joined: Nov 2016 From: South Africa Posts: 6 Thanks: 0 http://www.edwardsmaths.com/wp-conte...-Paper-Eng.pdf question 4 is the same diagram
 November 13th, 2016, 11:52 PM #3 Global Moderator   Joined: Dec 2006 Posts: 18,956 Thanks: 1603 The diagonals of a rhombus are perpendicular, so the product of their gradients is -1. The gradient of QS is -1/3 so the gradient of RT is 3. As RT contains the point (3, 9), RT has equation y = 3x (where x ∈ [-1, 3]). Thanks from topsquark

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# what is the diagram of rhombus

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