The following formulas describe either length, area, or volume. Combine the correct patterns in the formulas.

a) [[$ x^2y $]]

The formula describes the pattern A, B , C, D, E, F

b) [[$ xy $]]

The formula describes the pattern A, B, C, D, E, F

c) [[$ \displaystyle\frac {1} {2}x(x + y) $]]

The formula describes the pattern A, B, C, D, E, F

d) [[$ 2(x + y) $]]

The formula describes the pattern A, B, C, D, E, F

e) [[$ \pi x^2 $]]

The formula describes the pattern A, B, C, D, E, F

f) [[$ \displaystyle\frac {1} {2}xy $]]

The formula describes the pattern A, B, C, D, E, F

g) [[$ 2 \pi x $]]

The formula describes the pattern A, B, C, D, E, F

h) [[$ \pi x^2y $]]

The formula describes the pattern A, B, C, D, E, F