Maths Formulas to Remember Flashcards
1
Q
Midpoint of two points
A
x1+x2/2, y1+y2/2
2
Q
Equation of a Line
A
y=mx+c
3
Q
Adding and subtracting algebraic fractions
A
Upside-down ironing board method- same denominator, then cross multiply
4
Q
Simplifying algebraic fractions
A
Factorise numerator and denominator, then cancel same brackets and simplify factors, remember difference of 2 squared.
5
Q
distance between 2 points
A
d=√((x2 – x1)² + (y2 – y1)²)
5
Q
gradient of a line (m in y=mx+c)
A
x2-x1/y2-y1
6
Q
Equation of a line in point-slope form
A
y−y 1 =m(x−x 1)
7
Q
Area of a circle
A
Pir^2
8
Q
Circumference of a circle
A
2Pir
9
Q
Area of a trapezium
A
a+b/2 x h
10
Q
A
11
Q
Gradient of a line perpendicular to given
A
Negative reciprocal to m
