How to find the constant rate of proportionality

Find the area of the regular hexagon if a side is 20 cm.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Ahypothesis is: a the average squared deviations about the mean of a distribution of values b) an empirically testable statement that is an unproven supposition developed in order to explain phenomena a statement that asserts the status quo; that is, any change from what has been c) thought to be true is due to random sampling order da statement that is the opposite of the null hypothesis e) the error made by rejecting the null hypothesis when it is true