Pythagoras and the Juice Seller

Pythagoras and the Juice Seller
English Voice-over


Ghada Sulaiman Abdullah Marmash
Math teacher
King Abdullah II Schools for Excellence
Irbid, Jordan

Lesson Feedback


This video lesson presents a real world problem that can be solved by using the Pythagorean theorem. The problem faces a juice seller daily. He has equilateral barrels with equal heights and he always tries to empty the juice of two barrels into a third barrel that has a volume equal to the sum of the volumes of the two barrels. This juice seller wants to find a simple way to help him select the right barrel without wasting time, and without any calculations - since he is ignorant of mathematics. The prerequisite for this lesson includes knowledge of the following: the Pythagorean theorem; calculation of a triangle’s area knowing the angle between its two sides; cosine rule; calculation of a circle’s area; and calculation of the areas and volumes of solids with regular bases. Materials necessary include: equilateral containers of equal heights; sand; and measuring devices. Examples of in-class activities for the breaks between video segments include class discussions, individual calculations and small group problem solving.

Instructor Biography

Ghada Sulaiman Abdullah Marmash is a Math teacher at the King Abdullah II Schools for Excellence in Irbid, Jordan.

Additional Online Resources

Wikipedia: Pythagorean theorem
This article is about classical geometry.