Question

Please help!!!!!!!!!!

Answer 1

Answer:

$\large\boxed{a=4\sqrt3}$

Step-by-step explanation:

We have the triangle 30° - 60° - 90°.  In that triangle sides are in proportion

1 : √3 : 2 (look at the picture).

We have

$a\sqrt3=12$         multiply both sides by √3   (use √a · √a = a)

$3a=12\sqrt3$       divide both sides by 3

$a=4\sqrt3$

$b=2a\to b=2(4\sqrt3)=8\sqrt3$