Let the length of one side of the base square be a cm.
The Volume of a pyramid is

the area of the base is a^2,
we apply the formula



a=8 (cm)
Answer: 8 cm
Using thereoms/postulates, we know that the 60° angle and the (5z - 85)° angle are congruent
so to first find z..



now that we know z, we can find x
simply replace the z in (5z - 85) with 29
and add the entire angle to x to equal 180
(supplementary angles)




The answer is 27.625 !
hope this helpss !!