Question

How long is BC?
answer exactly, using radical if needed.​

Answer 1

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° =
`(OPPOSITE SIDE)/(HYPOTENUSE)`

`(1)/(2) = (x)/(4) \\\\CROSS MULTIPLYING\\\\2X= 4\\\\X= (4)/(2)\\ \\X= 2CM`

SO BC IS 2 CM LONGER

Answer 2

2 units

Explanation:

Sin(30) = BC/4

BC = 4×½ = 2