Help please?
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