Question

can anyone find this answer​

Answer 1

Answer:

AB = 4cm

Step-by-step explanation:

In triangle BCD....

DC² + BC² = BD² ( Pythagoras theorem )

12² + 3² = BD²

144+9 = BD²

BD = √153

In triangle ABD....

AB² + BD² = AD² ( Pythagoras theorem )

AB² = AD²- BD²

AB² = 13²-(√153)²

AB² = 169 - 153

AB² = 16

=> AB = √16

=> AB = 4 cm .Ans

Answer 2

Answer:

In triangle BCD,

Angle C= 90°

Therefore,

DB^2=BC^2+CD^2

=12^2+3^2

=144+9

=153

Hence,

DB=root 153

Now, In triangle ABD,

Angle B=90°

Therefore,

AD^2 =AB^2+ BD^2

13 ^2=AB^2+153

169-153=AB^2

AB=4 ans...

Hope this will help you.