# Core 1 Formulae

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- Created by: Harraseda
- Created on: 17-05-16 17:33

## Other questions in this quiz

## 2. Equation of a circle, with centre (a,b) and radius r

- r^2+(x-b)^2+(y-a)^2=0
- (x-a)^2+(y-b)^2=r^2
- (x-b)^2+(y-a)^2=r^2
- y=abx+r

## 3. What is the discriminant?

- b^2-(4ac)
- -b+(4ac)/2a
- 2a-4bc
- Square Root of: b^2-(4ac)

## 4. Length of a line from two points

- (y2-y1)/(x2-x1)
- (y-y1)=m(x-x1)
- Square Root of: (x2-x1)^2 + (y2-y1)^2
- [(x2-x1)^2 + (y2-y1)^2]^2

## 5. Gradient of a line

- (x2-x1)/2 , (y2-y1)/2
- (x2-x1)/(y2-y1)
- (y2-y1)/(x2-x1)
- (y-y1)=m(x-x1)

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