Question Number 185596 by Rupesh123 last updated on 24/Jan/23
Commented by mr W last updated on 25/Jan/23
$${this}\:{is}\:{a}\:{star}\:{polygon}\:\left\{\mathrm{10}/\mathrm{3}\right\}\:\left(={decagram}\right) \\ $$$${sum}\:{red}\:{angles}\:\mathrm{720}° \\ $$$$ \\ $$$${generallly}\:{for}\:{star}\:{polygon}\:\left\{{p}/{q}\right\}: \\ $$$${sum}\:{of}\:{angles}\:=\mathrm{180}{p}−\mathrm{360}{q} \\ $$