find by drawing and by calculation the resultant of two vector 3 unit and 4 unit inclined to each other at [a]30 [b]90 [c]120

Find by drawing and by calculation of resultant of two vector 3 unit and 4 unit incline to each other at A 30° B 90° C 20°

Pls I need the solving

3 in x direction

4 in direction angle A up toward y
Vx = 3 + 4 cos A
Vy = 4 sin A

|V| = sqrt [ (3+4cosA)^2 + (4 sin A)^2 ]

tangent of angle counterclockwise from x axis = Vy/Vx

I need answer to my question

Find by drawing and by calculation the resultant of two vectors 3units and 4units inclined to each other at (a)30 degree (b)90 degree (c)120 degree

Pls I need d workings

I need answer to my question

1

R²=A²+B²+2.A.B.Cos
R²=3²+4²+2.3.4cos 60
R²=25+24cos 60
R²=25+12
R²=37
R=6.0827

2

R=√A²+B²
=√3²+4²
=√25
=5

3

Solve it like I solved the first one