Find the indicated side of the triangle a=

Ar of triangle = 3b , Ar of triangle = 6a a = 12/root3

a = 12/√3

Step-by-step explanation:

Thanks to the given angle we can say that b is 2a , because the triangle is half of equilater triangle.

Now we can use the Pythagorean thoerm in this way

a^2 + 12^2 = (2a)^2

a^2 + 144 = 4a^2

3a^2 = 144

a^2 = 48

a = √48

a = √2^4 x 3

a = 4√3

a = 12/√3

incomplete question. how do you expect anyone to you when you do not post the question in its entirety?