Resultant of a vector

The vectors have magnitudes of 17 and 28 and the angle between them is 66°. Determine the magnitude of the resultant.

Give your answer to 1 decimal place, leave out the units.

Give your answer to 3 significant figures.

In the diagram ABCDEF is a regular hexagon and O is its centre.

Identify two vectors that are equal to r.

• a - b

• b - a

• -a - b

• 2a

• 2b

• a + b

• b - a

• a - b

• 2a

• 2b

• A

• B

• C

• D

• E

Give your answer to 3 significant figures.

• c + d

• c - d

• d - c

• - c - d

• c + d

• c - d

• d - c

• - c - d