Enlarged rectangle

The rectangle with dimensions of 8 cm and 12 cm is enlarged in a ratio of 5:4. What are the circumference and the area of the enlarged rectangle?

Correct result:

o =  50 cm
S =  150 cm2


a=8 cm b=12 cm  o1=2 (a+b)=2 (8+12)=40 cm k=54=1.25  o=k o1=1.25 40=50 cm
S1=a b=8 12=96 cm2  S=k2 S1=1.252 96=150 cm2

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