AREA VOLUME AND SURFACE

(pi = = 3.141592...)

Areas

square = a2

rectangle = ab

parallelogram = bh

trapezoid = h/2 (b1 + b2)

circle = pi r 2

ellipse = pi r1 r2

triangle = (1/2) b h

equilateral triangle = (1/4)(3) a2

triangle given SAS = (1/2) a b sin C

triangle given a,b,c = [s(s-a)(s-b)(s-c)] when s = (a+b+c)/2 (Heron's formula)

regular polygon = (1/2) n sin(360°/n) S2
when n = # of sides and S = length from center to a corner

Volumes

cube = a3

rectangular prism = a b c

irregular prism = b h

cylinder = b h = r2 h

pyramid = (1/3) b h

cone = (1/3) b h = 1/3 r2 h

sphere = (4/3) r3

ellipsoid = (4/3) pi r1 r2 r3

Surface Areas

cube = 6 a2

prism:
(lateral area) = perimeter(b) L
(total area) = perimeter(b) L + 2b

sphere = 4 r2