math (need help badly)
posted by rita .
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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