A dilated figure has a surface area of 10,990.8 in.^2. The figure was dilated by a scale factor of 6. What is the surface area of the original figure?

395,668.8 in.^2
1,831.8 in.^2
915.9 in.^2
305.3 in.^2

1 answer

When a figure is dilated by a scale factor \( k \), the surface area of the dilated figure is given by the formula:

\[ \text{Surface Area}{\text{dilated}} = k^2 \times \text{Surface Area}{\text{original}} \]

In this case, the scale factor \( k = 6 \) and the surface area of the dilated figure is \( 10,990.8 , \text{in}^2 \). We can set up the equation:

\[ 10,990.8 = 6^2 \times \text{Surface Area}_{\text{original}} \]

Calculating \( 6^2 \):

\[ 6^2 = 36 \]

Substituting this value into the equation gives:

\[ 10,990.8 = 36 \times \text{Surface Area}_{\text{original}} \]

Now, to find the surface area of the original figure, we can solve for \( \text{Surface Area}_{\text{original}} \):

\[ \text{Surface Area}_{\text{original}} = \frac{10,990.8}{36} \]

Calculating this gives:

\[ \text{Surface Area}_{\text{original}} = 305.3 , \text{in}^2 \]

Thus, the surface area of the original figure is:

\[ \boxed{305.3 , \text{in}^2} \]