hello mate
This is neha to help you here
answer
since its a right traingle we can use trignometric ratos to solve this problem
<A= 30°
AB=4CM
AB IS THE HYPTONUESE OF THE TRAINGLE = 4CM
AND BC IS THE OPPOSITE SIDE OF ANGLE 30°
SO,
SIN30° =[tex]\frac{OPPOSITE SIDE}{HYPOTENUSE}[/tex]
[tex]\frac{1}{2} = \frac{x}{4} \\\\CROSS MULTIPLYING\\\\2X= 4\\\\X= \frac{4}{2}\\ \\X= 2CM[/tex]
SO BC IS 2 CM LONGER
