Rectangular (1) C = 2 (a+b) (2) A = C ÷ 2-b (3) B = C ÷ 2-a (4) S = AB (5) A = S ÷ B.

Square (1) C=4a (2) S=a? (3) a=C÷4

circle( 1)c = 2πr =πd(2)r = c \2π(3)d = c\π(4)s =πr？

Trapezoidal (1)S =(a+b)h \2

Parallelogram (1) s = ah (2) a = s \ h (3) h = s \ a) a = s \ h (3) h = s \ a.

Three-dimensional graphics:

Cuboid (1) l length =(a+b+h)×4 (2) S length =(ab+ah+bh)×2 (3) V=abh=Sh.

Cubic (1) l positive =12a (2) a = l÷12 (3) s positive =6a? (4) V is positive =a?

The base of a cylinder (1) S =πr? (2) S side =Ch =2πr? H =πdh (3) S table = S side +2 S bottom (4) V=Sh =πr? h(5)h = v \s

cone( 1)v = 1/3SH = 1/3πr？ H(2)h = 3v S base

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