need help with (ii) only. thanks!

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secondary 3 A Maths Singapore

need help with (ii) only. thanks!

Date Posted: 3 months ago

done {{ upvoteCount }} Upvotes

clear {{ downvoteCount * -1 }} Downvotes

enclosed means perimeter

Date Posted: 3 months ago

Salted Egg

3 months ago

i see..was wondering what "enclosed" means. thank you so much!