Respuesta :
The Pythagorean Theorem is: c²= a²+b²
c²= 20²+21²
c²=400+441
c²=841
c=√841
c=29
∴The length of the missing side is 29ft.
The Pythagorean Theorem is: c²= a²+b²
c²= 20²+21²
c²=400+441
c²=841
c=√841
c=29
∴The length of the missing side is 29ft.