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August 14th, 2018, 11:03 AM   #1
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Working out perimeter of an envelope

You need a padded envelope to post the frame and photo.
Work out the perimeter of the padded envelope below.
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August 14th, 2018, 11:06 AM   #2
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I have worked the perimeter out as 20 cm x 2 = 40 cm then 25 cm x 2 = 50 cm then add 40 cm and 50 cm = 90 cm.

This is the correct way to work this out?
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August 14th, 2018, 12:00 PM   #3
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It's correct. Another correct way would be to add 20 cm to 25 cm, which gives 45 cm, and then multiply that by 2 to get 90 cm.
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