Question

a triangle with an area of 7cm² undergoes an enlargement and the new area is 63cm². What is tje scale factor of the enlargement.?​

Answer 1

New area / old area = 63/7 = 9

The actual area increased 9 times.

Area is a squared value, so the scale factor would be the square root of the increase.

Scale = sqrt(9)

Scale factor is 3