Trapezoid Fomula

pexels-photo-12732214.jpeg Elementary School/小学校
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teach all subjects. At my school,  all teachers are supposed to show their classes at least once a year and I opened an arithmetic class with teachers of the same grade. The content was trapezoid and its formula.

Area of Trapezoid Formula

Area of the trapezoid formula can be defined as A = ½ (a + b) h in English.  Surely, it is the same in Japan but the order is different.  In Japan, it can be taught A = (a + b) h ½.  I have heard that we should care about teaching its order too. Thus, it can be expressed not h(a + b) but (a + b) h, though the result is the same.  I wonder where the difference comes from.

Area of Trapezoid - Formula | How to Find the Area of a Trapezoid?
The area of a trapezoid can be calculated if the length of its parallel sides and the distance (height) between them is ...

Teaching Material 

Under the GIGA school project going on currently, there are many free and accessible online materials issued by Japanese BOEs. A coworker of mine suggested a nice one from Kumamoto prefecture.  It is easy to use and all students enjoyed using it, including those who are in special need. 

Even people who do not understand Japanese, I think, can be use this material to get concepts of areas of polygons.

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