**Scalars and Vectors**

**Scalar:**A quantity like mass or temperature which only has a magnitude**Vector:**A quantity like heat flux or force which has both a magnitude and a direction (denoted by a bold faced character, an underlined character, or a character with a arrow on it)**Vector Addition:**Vector Addition follows the parallelogram law described be the figure

**Resolution of a Vector:**A vector can be resolved along different directions using the parallelogram rule. The figure shows how one resolves vector__c__into components__a__and__b__which are along the given directions

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**The math you need:****For a right triangle:**

a^{2}+
b^{2 }= c^{2}

tan(q) = b/a

sin(q) = b/c

cos(q) = a/c

**For a general triangle:**

a+b+g=180^{o}

Sine law:

Cosine law:

o
**A line
intersecting parallel lines:**