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Question Number 19330 by Tinkutara last updated on 09/Aug/17

A triangle with perimeter 7 has integer  side lengths. What is the maximum  possible area of such a triangle?

$$\mathrm{A}\:\mathrm{triangle}\:\mathrm{with}\:\mathrm{perimeter}\:\mathrm{7}\:\mathrm{has}\:\mathrm{integer} \\ $$$$\mathrm{side}\:\mathrm{lengths}.\:\mathrm{What}\:\mathrm{is}\:\mathrm{the}\:\mathrm{maximum} \\ $$$$\mathrm{possible}\:\mathrm{area}\:\mathrm{of}\:\mathrm{such}\:\mathrm{a}\:\mathrm{triangle}? \\ $$

Answered by mrW1 last updated on 09/Aug/17

3/3/1⇒A=(√(3.5×0.5×0.5×2.5))=1.479  3/2/2⇒A=(√(3.5×0.5×1.5×1.5))=1.984=max

$$\mathrm{3}/\mathrm{3}/\mathrm{1}\Rightarrow\mathrm{A}=\sqrt{\mathrm{3}.\mathrm{5}×\mathrm{0}.\mathrm{5}×\mathrm{0}.\mathrm{5}×\mathrm{2}.\mathrm{5}}=\mathrm{1}.\mathrm{479} \\ $$$$\mathrm{3}/\mathrm{2}/\mathrm{2}\Rightarrow\mathrm{A}=\sqrt{\mathrm{3}.\mathrm{5}×\mathrm{0}.\mathrm{5}×\mathrm{1}.\mathrm{5}×\mathrm{1}.\mathrm{5}}=\mathrm{1}.\mathrm{984}=\mathrm{max} \\ $$

Commented by Tinkutara last updated on 10/Aug/17

How to take the sides if perimeter was  a large number?

$$\mathrm{How}\:\mathrm{to}\:\mathrm{take}\:\mathrm{the}\:\mathrm{sides}\:\mathrm{if}\:\mathrm{perimeter}\:\mathrm{was} \\ $$$$\mathrm{a}\:\mathrm{large}\:\mathrm{number}? \\ $$

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