measurements
circles
arcs
sectors
A = ( θ / 360 ) / π r ^ 2
circumference C = 2 π r
A = π r ^ 2
surface area
sphere
cone
cylinder
A = 2 π r h + 2 π r ^ 2
A = 4 π r ^ 2
A = π r s + π r ^ 2
radian measurements
volume
cone
sphere
pyramid
V = 1 / 3 A h
V = 1 / 3 π r ^ 2 h
V = 2 / 3 π r ^ 3
capacity
1000 cm ^ 3 = 1000 m = 1 L
1 m ^ 3 = 1000 dm ^ 3 = 1000 L = 1000 kL
arc length
l = sieta * r