The volume of a pyramid can be calculated using a known formula. In this formula B is the base area, and h is the height of a pyramid.
V=1/3Bh
In our exercise the base of the pyramid is a square. Therefore, the base area will be equal to the squared length of the side length of a base, let's call it s.
B= s^2
Let's substitute it for B into the volume formula.
V=1/3 s^2h
We are given that the height is 11.5cm and the volume is 862.5cm. Let's substitute these values into the formula and solve the equation for s. Notice that, since s represents the side length, we will consider only a positive case when taking a square root of s^2.
