# Maths Formulas and uses

Teacher recommended

?- Created by: hannahburton
- Created on: 09-01-13 16:23

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- Maths Formulas & uses
- speed= distance / time
- Therefore: time= distance/speed & distance = speed * time
- This means that on any question where they ask you for speed you need to identify those items
- The unit for speed is m/s, distance is m, and time is s

- The Quadratic Formula
- needs to be in the form ax2+bx+c= 0 to be applied
- if there is no ax2 then it is not a quadratic, it is linear

- The Sine Rule
- Used when you have 2 angles and 1 side, or 2 sides and 1 angle
- USED IN TRIANGLES
- a/sinA =b/sinB

- The Cosine Rule
- USED IN TRIANGLES
- a2=b2+c2- 2bccosA

- speed= distance / time

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