Answer :
i think it’s 29yd
a^2 +b^2 =c^2
20^2 + 21^2= c^
400+441=841
square root 841= 29
that’s the answer
a^2 +b^2 =c^2
20^2 + 21^2= c^
400+441=841
square root 841= 29
that’s the answer