97.5 square inches convert to square centimeter. 1cm=0.39in

Question

need help setting up formula

Answer 1

The key to this question is setting up the conversion between square inches and square centimeters.  You treat units the same as numbers,  if you square a number you square its unit and vice versa.

 

(1cm)2 = (0.39 in)2

 1 cm2 = 0.1521 in2

 

  97.5 in2 ( 1 cm2/0.1521in2) = 641 cm2

Answer 2

1 in = 2.54 cm

1 in² = 6.45 cm²

97.5 in² = 629.03 cm²