Answer
a. 6.45 sq.cm.
b. 20 sq. in.
Work Step by Step
There are 2.54 cm in 1 inch. To find the number of square centimeters in a square inch, square 2.54.
$2.54^{2}=6.4516$
To get the number of square inches in 129 square centimeters, divide 129 by the number of square centimeters in 1 inch (6.4516).
$129\div 6.4515\approx 20$
