# Dr. Frank's Math Minute

Wang Education is pleased to introduce *Dr. Frank's Math Minute. Dr. Frank's Math Minutes* are short and fun video clips
that show the power and applicability of mathematics. They are accompanied by free worksheets designed for students with varying
levels of mathematics knowledge.

### Fraction Pizzeria

Someone has added a whole pizza to Dr. Frank's table! It shouldn't be any problem for him to subtract it a fraction at a time. But
what about multiplying and dividing? Watch as **Dr. Frank demonstrates all four fraction operations!**

### Similar Triangles and the St. Louis Arch

2500 years ago, Thales used Geometry to find the height of the Egyptian Pyramids. Today, Dr. Frank uses *Similar* methods
to find height of the St. Louis Arch!

It is believed that Thales of Miletus (624 to 547 BC) was the first person to **use similar triangles to find the
height of a very tall object.** Thales noted that at a particular time of day, the height of an object and the length
of its shadow were the same. He then used this observation to calculate the height of the Egyptian pyramids.
Later, he brought this knowledge back to Greece and his observations are considered to be a forerunner of the
technique of using **similar triangles** to solve such problems.

Similar Triangles and the St. Louis Arch

### Hamburger Mathematics

*Dr. Frank's Math Minute* gets sidetracked by Dr. Frank's lunch hour. Fortunately, even the hamburger joint next door is a
math-friendly place. Join Dr. Frank for a burger and an explanation of **Newton's Law of Cooling.**