A = bh ÷ 2
s = 1/2(a + b + c)
A = s(s - a)(s - b)(s - c))
A = ab ÷ 2 × sin(γ)
α = arcsin(a × sin(β) ÷ b)
γ = 180 - α - β
A = ab ÷ 2 × sin(γ)
α = 180 - β - γ
h = a × sin(γ)
b = a × sin(β) ÷ sin(α)
A = bh ÷ 2
α = 180 - β - γ
b = c × sin(β) ÷ sin(γ)
a = c × sin(α) ÷ sin(γ)
h = a × sin(γ)
A = bh ÷ 2
A = a2
a = edge length
A = l × w
l = length
w = width
A = 1/2(a + b)h
a = base a
b = base b
h = height
A = b × h
b = base
h = height
A = a × h
a = edge length
h = height
A = p × q2
p = diagonal p
q = diagonal q
A = πr2
r = radius
A = πR2 - πr2
R = radius
r = radius
A = πab
a = axis a
b = axis b
A = (θ ÷ 360)πr2
r = radius
θ = angle
A = (θ × π360 – sin(θ)2) × r²
r = radius
θ = angle
A = (a2 × 5) ÷ (4 × tan(π ÷ 5))
a = edge length
A = (a2 × 6) ÷ (4 × tan(π ÷ 6))
a = edge length
A = (a2 × 8) ÷ (4 × tan(π ÷ 8))
a = edge length
A = (a2 × n) ÷ (4 × tan(π ÷ n))
a = edge length
n = number of sides
A = 1/2 × d × (h1 + h2)
d = diagonal
h1 = height 1
h2 = height 2
A = (l × w) - (a × b)
l = outer length
w = outer width
a = inner length
b = inner width