Answer
$A$ = 100 ft$^{2}$
$P$ = 40 ft
Work Step by Step
Since the length and width of this object are same it is a square.
Area of a square: $A$=$s$$^{2}$
$A$ = (10 ft)$^{2}$
$A$ = 100 ft$^{2}$
Perimeter of a square: $P$ = 4$s$
$P$ = 4 * 10 ft
$P$ = 40 ft
