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


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