find the volume of a pentagonal pyramid with a base area of 14 and a height of 35
+37084 Should have gone here:
http://math.tutorvista.com/geometry/volume-of-a-pyramid.html
+37084 I looked this one up:
V= 5/12 TAN(54)ha^2
Substituting:
5/12 tan(54) (35)(14^2) = 3934.16 units^3 ( I do not know the units in your question)
+8 Always the pyramid volume is:
V= (1/3)*A *h where A is the base area and h is the height
V = (1/3)*14 *35 =163.33 units
+37084 Oldeng...
Yah, that is true for a TRIANGULAR pyramid only...
...question asked about a PENTAGONAL pyramid.....hence the different formula.
+23251 Oldeng has the correct formula; it works for all pyramids because he is using the area of the base.
The 'a' in the formula by ElectricPavlov is the length of one side of the base, not the area of the base.
+37084 SORRY Folks ! I thought the equation I had was a = area , but in that equation a= length of one side of the base......
Apologies ! Thanx oldeng and geno !!
+37084 Should have gone here:
http://math.tutorvista.com/geometry/volume-of-a-pyramid.html
