3 years ago

HELPPPPP ASAPPPPPPPPPPPPPPPP PLSSS

Mathematics

1 answer:

balandron [24]3 years ago

4 0

Answer:

B) 2\ sq.rt{3}units

Step-by-step explanation:

using Pythagoras theorem

a^2+ b^2=c^2

a^2+ 3^2=(√21)^2

a^2+9= 21

a^2=21-9

a^2=12

a=√12

a=2√3

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