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Part of 2019 May Olympiad

Problems(2)

Source: May Olympiad 2019 level 2

Find the smallest positive integer

N

of two or more digits that has the following property: If we insert any non-null digit

d

between any two adjacent digits of

N

we obtain a number that is a multiple of

d

divide a square paper into 3 parts, by 2 straight cuts, create an obtuse

Source: Olimpíada de Mayo / Maio (May Olympiad) 2019 L1

You have to divide a square paper into three parts, by two straight cuts, so that by locating these parts properly, without gaps or overlaps, an obtuse triangle is formed. Indicate how to cut the square and how to assemble the triangle with the three parts.

geometrycombinatoricssquarecutting the paperpaperObtuse triangle