The lengths [[$ a $]], [[$ b $]] and [[$ c $]] are measured in centimeters. Are the following formulas used to calculate length, area
or volume?

a) [[$ K = abc $]]

The formula is used to calculate length area volume.

b) [[$ R = 4a^2 $]]

The formula is used to calculate length area volume.

c) [[$ B = \pi c^2 $]]

The formula is used to calculate length area volume.

d) [[$ L = \displaystyle\frac {4} {3} \pi b^3 $]]

The formula is used to calculate length area volume.

e) [[$ Y = 4a + 3b $]]

The formula is used to calculate length area volume.

f) [[$ G = 2\pi a^2 $]]

The formula is used to calculate length area volume.

g) [[$ X = 3ab $]]

The formula is used to calculate length area volume.

h) [[$ M = 9c^2 $]]

The formula is used to calculate length area volume.