igcse maths formulae
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sin rule
a/sinA = b/sinB = c/sinC
cosx =
adj/hyp
gradient =
change in y / change in x
cos rule
c² = a² + b² - 2abcosc
length of the arc of a sector of a circle
length = θ/360 x 2∏r
tanx =
opp/adj
sinx =
opp/hyp
mean of grouped data
sum of all fX / sum of all f
inverse proportion
K = P x Q
direct proportion
K = P/Q
g² - a² =
(g - a)(g +a)
ym + gm + yk +gk =
(y + g)(m + k)
Area of a triangle
A = 1/2(absinC)
simple interest
A = P(1 + i x n)
compound interest
A = P(1 + i) ^ n
sector of a circle
A= θ/360 x ∏r²
quadratic formula
x = (-b ± √(b² - 4ac) )/2a