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Question Number 176820 by Ar Brandon last updated on 27/Sep/22

Commented by mr W last updated on 27/Sep/22

Commented by som(math1967) last updated on 27/Sep/22

$$ialsomisread$$$$x=\frac{180-20}{2}=80$$$$thanksRashidsirforcorrection$$

Commented by mr W last updated on 27/Sep/22

$$imisreadasoctagon.$$$$incaseofoctadecagon,therightanswer$$$$isindeed80°.$$$$\frac{360}{9}-\frac{360}{18}=20$$$$x=\frac{180-20}{2}=80°$$$$ArBrandonsir:$$$$sorryformymistake!$$

Commented by cortano1 last updated on 27/Sep/22

$$\mathrm{what}\mathrm{the}\mathrm{formula}\mathrm{for}\mathrm{interior}\mathrm{angle}\mathrm{sir}\mathrm{W}?$$

Commented by Ar Brandon last updated on 27/Sep/22

Got it! Thanks!

Commented by Ar Brandon last updated on 27/Sep/22

$$\mathrm{Thanks}\mathrm{so}\mathrm{very}\mathrm{much}!$$

Commented by Rasheed.Sindhi last updated on 27/Sep/22

$$\mathcal{B}ut\mathit{s}\mathit{i}\mathit{r}inthequestion\mathit{o}\mathit{c}\mathit{t}\mathit{a}\mathit{d}\mathit{e}\mathit{c}\mathit{a}\mathit{g}\mathit{o}\mathit{n}$$$$ismentionedinsteadof\mathit{o}\mathit{c}\mathit{t}\mathit{a}\mathit{g}\mathit{o}\mathit{n}?$$

Commented by mr W last updated on 27/Sep/22

Commented by mr W last updated on 27/Sep/22

$$2x+5°=180°$$$$\Rightarrow x=\frac{180-5}{2}=87.5°$$

Commented by mr W last updated on 27/Sep/22

Commented by mr W last updated on 27/Sep/22

Commented by Ar Brandon last updated on 27/Sep/22

$$\mathrm{Please}\mathrm{Sir},\mathrm{what}\mathrm{do}\frac{360}{8}-\frac{360}{9}\mathrm{mean}?$$$$\mathrm{Is}\mathrm{it}\mathrm{a}\mathrm{theory}?$$

Commented by Ar Brandon last updated on 27/Sep/22

OK sir

Commented by mr W last updated on 27/Sep/22

$$interiorangle=180°-exteriorangle$$$$=180°-\frac{360°}{n}$$

Commented by Ar Brandon last updated on 27/Sep/22

Thank you Sir

Commented by Ar Brandon last updated on 27/Sep/22

Right answer is 80° , sir ��

Commented by mr W last updated on 27/Sep/22

$$87.5°iscorrect!$$$$\frac{360}{8}-\frac{360}{9}=5$$$$x=\frac{180-5}{2}=87.5°$$

Commented by Ar Brandon last updated on 27/Sep/22

OK sir. If you both agree on that. Thanks!

Commented by mr W last updated on 27/Sep/22

$$thisisnotanopinion,butafact!$$$$itisprovedthatxisandcanonlybe$$$$87.5°.$$

Commented by Tawa11 last updated on 28/Sep/22

$$\mathrm{Great}\mathrm{sirs}.$$

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