geometry help

21in./15in.=1.4

1.4in.^2=1.96

196in.^2/1.96=100in.^2

196/21=(28/3)

(28/3)*15=140

140 in.²

21/15=1.4

So, the similar shapes are 1.4 apart.

But, we have to square 1.4 - 1.4^2=1.96

Thus, we get \(\frac{196}{1.96}=\boxed{100}\) centimeters ^2