# The Leaning Tower of Pisa

### Lucy Nye

History

There is much controversy over who was the architect behind the tower of Pisa, but Diotisalvi seems to be the most likely to have constructed it. Construction was carried out in three phases. It was started on August 14, 1173, and was not finished until 1372. Galileo was said to drop two balls off the top of the tower to test his theory, now called the theory of uniform acceleration, this led to the Leaning Tower of Pisa becoming known. Another thing that led to this is the tower began leaning to one side. This happened because the ground was softer on one side of the tower, and that combined with the weight of the building caused it to sink into the ground. From 1964 and on, the tower has been under constant surveillance and multiple measures have been taken to keep it from collapsing, such as ground being taken out of the other side to level it, metal cables attached to hold it from falling down, and the bells being taken out of the top to remove excess weight. Also, in 1987 the tower was declared part of the Piazza del Duomo UNESCO World Heritage Site giving it further importance and prompting people to put effort into keeping it from collapsing.

# Diagram of the Leaning Tower of Pisa*

Surface Area Calculations

Surface Area Calculations for the Larger cylinder:

R= 23.226

H=156.3

=

26198.81 ft2

*All measurements are in feet

Calculations for smaller cylinder

Surface area calculations for smaller cylinder:

R= 11.052

H= 27

=

596.808 ft2

# Total Surface Area

* 26795.618 ft2*

# Volume Calculations

Volume of larger cylinder

R= 23.226

H=156.3

=

264750.907001 ft3

Volume of smaller cylinder

R= 11.052

H= 27

=

3297.961008 ft3

# Total Volume

264750.907001 ft3 + 3297.961008 ft3

=

**268,048.868009 ft3**

# FUN FACT

How many large moving boxes can fit into the Leaning Tower of Pisa?

Moving box= 28.16667 ft2

Answer: 95o large moving boxes