Given two vectors a1 and a2 where the magnitude of these

Question

Given two vectors A1 and A2. Where the magnitude of these two vectors are A1 = 51 N, and A2 = 80 N. And where θ1= 326^o and θ2 =265^o. The angles are measured from the positive axis with the counter clockwise angular direction as positive. Find the magnitude of the resultant vector F, where f = A1 +A2?