Question Number 156296 by cortano last updated on 10/Oct/21
Commented by MJS_new last updated on 10/Oct/21
$$\mathrm{20} \\ $$
Commented by cortano last updated on 10/Oct/21
$$\mathrm{20}\:\mathrm{or}\:\mathrm{400}\:? \\ $$
Commented by MJS_new last updated on 10/Oct/21
$$\mathrm{sorry}\:\mathrm{the}\:\mathrm{side}\:\mathrm{is}\:\mathrm{20},\:\mathrm{the}\:\mathrm{area}\:\mathrm{is}\:\mathrm{400} \\ $$
Commented by cortano last updated on 10/Oct/21
$$\mathrm{thank}\:\mathrm{you} \\ $$