Geometric shapes have algebraic formulas for determining perimeter, area, surface area, and volume. The letters in the formulas stand for length, width, side, base, height, diameter, and radius:
l: length
w: width
s: side
b: base
h: height
d: diameter
r: radius
In this list, the shape is followed by two formulas, the first formula is for the perimeter (P) or circumference (C), and the second formula is for the area (A):
Rectangle:
P = 2(l + w) = 2l + 2w
A = lw
Square:
P = 4s
A = s2
Triangle:
P = s1 + s2 + s3
A = 1⁄2bh
Trapezoid:
P = s1 + s2 + s3 + s4
A = 1⁄2h(b1 + b2)
Parallelogram:
P = 2(b + s) = 2b + 2s
A = bh
Circle:
In this list, the shape is followed by two formulas, the first formula is for the surface area (SA), and the second formula is for the volume (V):
Rectangular prism (box):
SA = 2lw + 2lh + 2wh
V = lwh
Cylinder:
Sphere:
