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secondary 4 | E Maths
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secondary 4 chevron_right E Maths chevron_right Singapore

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Date Posted: 2 months ago
Views: 19
Eric Nicholas K
Eric Nicholas K
2 months ago
For your info, the lengths of such papers are such that the longer length of a paper is square root 2 times its shorter length.

This is partly why we can, say, put two A4 papers side by side to form an A3 paper.

You can think of the rectangles as “similar rectangles”.
Eric Nicholas K
Eric Nicholas K
2 months ago
A4: 210 x 297
A3: 297 x 420
A2: 420 x 594
A1: 594 x 840

By inspection, A1 is twice of A2, A2 is twice of A3 and A3 is twice of A4.

By analogy, A0 is twice of A1 and A4 is twice of A5.

A0/A5
= A0/A1 times A1/A2 times A2/A3 times A3/A4 times A4/A5
= 2 x 2 x 2 x 2 x 2
= 2^5 (A0 to A5 is “five grades down”)
= 32

Having said that, I don’t recall papers of size A5. I only remember size B5.

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Eric
Eric's answer
22 answers (A Helpful Person)
1st
Try to cut the various paper sizes and then slot them into jigsaw puzzle.

You shd see that they slot into pattern like my drawing.