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March 28, 2015

Posted by **pitigoiu** on Tuesday, April 2, 2013 at 3:35pm.

a) 213.3cm2

b) 67.5cm2

c)53.3cm2

d)1.5cm2

I don't think any of the choices match the answer (90cm2)?

- math -
**Reiny**, Tuesday, April 2, 2013 at 4:06pmAfter the scaling, the new shape is similar to the old shape

areas of similar shapes are proportional to the square of their sides

120 ft^2/2^2 = A/1.5^2

120/4 = A/2.25

A = 120(2.25)/4 = 67.5

OR

suppose the actual room was 10 ft by 12 ft ---> area = 120 ft^2

in our scale the room would be 7.5 cm by 9 cm

area of scaled room = 7.5(9) or 67.5 cm^2

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