Answer:
B
Step-by-step explanation:
the perimeter (P) of a rectangle is calculated as
P = 2l + 2w ( l is the length and w the width ) , then
P = 2(3[tex]\sqrt{15}[/tex] ) + 2([tex]\sqrt{15}[/tex] ) ← distribute both parenthesis )
= 6[tex]\sqrt{15}[/tex] + 2[tex]\sqrt{15}[/tex]
= 8[tex]\sqrt{15}[/tex]
