Answer:
82
Step-by-step explanation:
1'st step: [tex]a^{2}[/tex] + [tex]b^{2}[/tex]= [tex]c^{2}[/tex] is the formula for the pythagorean theorem
2'nd step : [tex]18^{2}[/tex] + [tex]80^{2}[/tex] = [tex]c^{2}[/tex]
3'rd step: 324+6400 = [tex]c^{2}[/tex]
4'rd step: 6724= [tex]c^{2}[/tex]
5'th step: [tex]\sqrt{6724}[/tex] =82
6'th step : therefore the value of c is 82 cm
