1. Draw a sketch of the triangle ABC. (see attachment). Use the Cosine rule to determine the interior angles of the triangle.
2. Convert the measurement of the mass into the value of the weight (in Newton):
3. The force has the same magnitude as the force but is pointing in the opposite direction. The force is produced by the forces of the two strings. To calculate their magnitude use Sine rule.
4. I've got and
denotes the force which effects in the direction of CA.