Ratio - rectangle

The rectangle has dimensions 6 cm and 9 cm. How many times increases area and its perimeter, when its dimensions increase in the ratio 5:3?

Correct result:

k(S) =  2.78
k(o) =  1.67

Solution:

k(S)=(5/3)2=2.78k(S)=(5/3)^{ 2 }=2.78
k(o)=5/3=1.67k(o)=5/3=1.67

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