the vertices of triangle DEF are D(5,12)and E(2,7) and F(8,4)
Triangle DEF undergoes an enlargement with the centre ,O, and scale factors k.Its image is D`E`F` where D(5,12)arrow D`(7.5,18)
a)How do i detremine the value of k

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1. It looks to me like the new triangle is 1.5 times larger. All primed coordinates are 1.5 times the original. The center of the expansion is the origin (O).

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2. 778448485

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