Question

Triangle RST is the pre-image of triangle UVW with a scale factor of 3. Find the area of triangle UVW if the area of triangle RST is 9 cm2.

Answer 1

We determine the area of the triangle UVW given that we have a scale factor of 3 by multiplying the area of triangle RST by the square of the scale factor. That is,
area of UVW = (9 cm²)(3²)
= 81 cm²
Thus, the area of triangle UVW is equal to 81 cm².