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**Speed - Time Graphs**

- Acceleration ⟶ find positive gradient of the line, m/s²
- Deceleration ⟶ find negative gradient, m/s²
- Horizontal line above 0 m/s² = Constant Speed, m/s
- Distance = Area under the line

**Estimation of Area under the curve**

• Concaving curve = underestimate

• Convex curve = overestimate

**Equation of a Circle**

- x² + y² = r²
- Centre = (a,b) ⟶ r² = (x - a)² + (y - b)²
- Radius cannot be a negative value.

When it comes to IGCSE/GCSE Maths, do you remember which direction does a graph move?

**Transformations of graphs, y=f(x)**

**Inside bracket = x axis**

in vector, a = inverse the sign in the bracket.

**Outside bracket = y axis**

in vector, a = same as it is outside the bracket.

That's the end of the topic!

Drafted by Bonnie (Mathematics)