Respuesta :

Answer:

3.9

Step-by-step explanation:

tan = opposite side/adjacent side

tan 61 = 7.1/QR

QR tan 61 = 7.1

QR = 7.1/tan 61

     = 3.9

Note:  If you memorize the definitions of all the trig functions, then these kinds of problems will be much easier.  OK?