Answer:
perimeter = 16
mm , area = 80 mm²
Explanation:
the sides of a square are congruent ( equal )
the perimeter (P) of a square is then calculated as
P = 4s ( s is the side length )
here s = 4
, then
P = 4 × 4
= 4 × 4 ×
= 16
mm
the area (A) of a square is calculated as
A = s² = ( 4
)² = 4² × (
)² = 16 × 5 = 80 mm²