[tex]sin = \frac{opp}{hyp} [/tex]
[tex] \sin(60) = \frac{opp}{4} [/tex]
[tex]opp = 3.464101615[/tex]
The length of QR is 3.5
//
[tex] {c}^{2} - {b}^{2} = {a}^{2} [/tex]
[tex] {4}^{2} - {3.464101615}^{2} = {4.000.......}^{2} [/tex]
[tex] \sqrt{4.000.......} = 2[/tex]
The length of PQ is 2
