Question

Anyones let me know how to do it?

Answer 1

B

Explanation:

assuming you require problem 3

using the Sine Rule in Δ ABC and the exact values

sin45° =
`(1)/(√(2) )` , sin30° =
`(1)/(2)`

`(AB)/(sin45)` =
`(BC)/(sin30)` , that is

`(8)/(sin45)` =
`(BC)/(sin30)` ( cross- multiply )

BC sin45° = 8 sin30°

BC ×
`(1)/(√(2) )` = 8 ×
`(1)/(2)` = 4 ( multiply both sides by
`√(2)` to clear the fraction )

BC = 4
`√(2)`