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square
4s
or
s²

rectangle
P = l + l + w + w
P = 2 l + 2 w

right triangle
P = a + b + c

isosceles triangle
A = base X height / 2

circle - circumfrance
C = πd
C = 2πr

circle - area
A = πr²

rectangle solid
V = lwh

cylinder
V = πr²h

cube
V = s³