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Help please?

 May 18, 2018
 #1
avatar+429 
+2

21in./15in.=1.4

1.4in.^2=1.96

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

 

smileysmileysmiley

 May 18, 2018
 #2
avatar
0

196/21=(28/3)

(28/3)*15=140

140 in.²

 May 18, 2018
 #3
avatar+3849 
+1

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

smileysmiley

.
 May 18, 2018
edited by tertre  May 19, 2018
edited by tertre  May 19, 2018

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