Answer:
[tex]\displaystyle 76\:cm.[/tex]
Step-by-step explanation:
[tex]\displaystyle 2l + 2w = P \\ \\ \boxed{76} = 36 + 40 \Rightarrow 76 = 2[18] + 2[20] \\ \\ \boxed{76 = P} [/tex]
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Perimeter:-
[tex]\\ \rm\rightarrowtail 2(L+B)[/tex]
[tex]\\ \rm\rightarrowtail 2(20+18)[/tex]
[tex]\\ \rm\rightarrowtail 2(38)[/tex]
[tex]\\ \rm\rightarrowtail 76cm[/tex]
