Question

Ab is 47.32 cm
If true then enter $1$ and if false then enter $0$

Answer 1

In $△ABC$
$\tan 60=\frac{AB}{BC}$
$AB=\sqrt{3}BC=x$
Let $BC=x,AB=\sqrt{3}x$
In $△ABD$,
$\tan 45=\frac{AB}{BD}$
$BD=AB$
$BC+CD=AB$
$x+20=x\sqrt{3}$
$x=\frac{20}{\sqrt{3}-1}$
$x=27.32$
Thus, $AB=27.32$ cm and $BC=27.32\sqrt{3}=47.32$