The ratio of corresponding sides of similar plane figures is twenty-eight inches divided by seven inches. If the area of the smaller figure is fifteen square inches, what is the area of the larger figure?

36 sq ft.

60 sq ft

120 sq ft.

240 sq ft.

Question

The ratio of corresponding sides of similar plane figures is twenty-eight inches divided by seven inches. If the area of the smaller figure is fifteen square inches, what is the area of the larger figure?

36 sq ft.

60 sq ft

120 sq ft.

240 sq ft.

anonymous · Answer

240 sq ft.

anonymous · Answer

yup

anonymous · Answer

Someone needs to smack the writer of that question for putting inches in the ratio.  Ratios are scalars and are unit independent. ^_^

anonymous · Answer

The dimensions will divide out.

phi · Answer

Has anyone noticed that the question gives sq in. and the answer sq ft?

anonymous · Answer

I know...but it's bad to have them in the first place.  That way the student doesn't get the idea that the ratio is different when using cm instead of in.