Question

suppose you know the coordinates of the vertices of a triangle. Explain how you would find the coordinates of the vertices of its image after a dilation with a scale factor of r

Answer 1

If the vertices of the triangle are

(a, b), (c, d), and (e, f)

We want to dilate it by scale factor r

Multiply each coordinate of the points by r

The image of the point (a, b) is (ar, br)

The image of the point (c, d) is (cr, dr)

The image of point (e, f) is (er, fr)