don steward
mathematics teaching 10 ~ 16

Saturday, 9 April 2016

generalising GCSE questions (10)

OCR ask students to use vectors to establish that two lines are parallel
(they are also the same length)

the generalisation (SP is also parallel and equal to RQ) is a theorem credited to Pierre Varignon (1731)

what happens when there is a reflex angle in the quadrilateral?

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