Enlargements (Leaving Cert Mathematics): Flashcards

Transformation changing size, keeping proportions the same

The original shape before transformation

The new shape after the enlargement

Fixed point from which the enlargement takes place

Number showing how many times bigger/smaller image is than object

rac{ ext{image side}}{ ext{object side}}

Image side $= k imes$ object side

Centre of enlargement and scale factor

That vertex doesn't move, stays in same position

Smaller figure (reduction)

Bigger figure (true enlargement)

Join corresponding vertices, extend lines until they meet

$k^2 imes$ area of object

rac{1}{k} where $k$ is original scale factor