calculate to 2 s.f the length of a diagonal of a square that measures 20cm by 20cm

it is revision test17 for new general mathematics
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?????????????? "2sf"...maebee that be square ft ?????????

diagonal av square with all sides=20...square root(2)*20

sqroot(2)=1.41421 35623 73095 04880 16887 24209 69807...

=28.284271247461902
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