## College Physics (4th Edition)

(a) $929~cm^2$ (b) $10,000~cm^2$ (c) $11~ft^2$
(a) We can convert $1~ft^2$ to units of $cm^2$: $1~ft^2\times \frac{(12~in)^2}{(1~ft)^2}\times \frac{(2.54~cm)^2}{(1~in)^2} = 929~cm^2$ (b) We can convert $1~m^2$ to units of $cm^2$: $1~m^2\times \frac{(100~cm)^2}{(1~m)^2} = 10,000~cm^2$ (c) We can estimate the number of square feet in $1~m^2$ without using a calculator: $10,000~cm^2 \times \frac{1~ft^2}{929~cm^2} \approx 11~ft^2$