Answer:
90 cm
Explanation:
The envelope is in the form of a rectangle with:
• Width = 20 cm
,
• Length = 25cm
The perimeter of a rectangle is calculated using the formula:
[tex]P=2(L+W)[/tex]
Substitute the given values:
[tex]P=2(20+25)=2\times45=90\operatorname{cm}[/tex]
The perimeter of the envelope is 90 cm.
