Question

plzz tell me answer it's urgent plzz ​

Answer 1

Answer:

$\sqrt{3} a \div 2$

Step-by-step explanation:

AB = a

BD = a / 2

by Pythagoras theorm ,

${ad}^{2} = {a}^{2} - {a}^{2} \div 4$

=

$3 {a}^{2} \div 4$

by taking square root both side

AD = root 3 a / 2