P1 Coordinate Geometry Flashcards
1
Q
Formula for a straight line:
A
𝑦 - 𝑦₁ = m(𝑥 - 𝑥₁)
2
Q
Formula for gradient:
A
𝑦₂ - 𝑦₁ / 𝑥₂ - 𝑥₁
3
Q
Formula for midpoint:
A
((𝑥₂ - 𝑥₁) / 2, (𝑦₂ - 𝑦₁) / 2)
4
Q
Formula for distence
A
sqr( (𝑥₂ - 𝑥₁)² + (𝑦₂ - 𝑦₁)² )
5
Q
Fact for parallel lines
A
The gradients are the same
6
Q
Fact for perpenciular
A
The gradients times together to equal -1
7
Q
Gradient for perpendicular bisectors
A
The gradient is the negative reciprocal of the original lines gradient
