Right triangle or not

Exercise and reference answers

Upper category

RIGHT

Lower category

NOT

Items

1. Category

   RIGHT

   Item

   3-4-5

2. Category

   NOT

   Item

   2-3-4

3. Category

   RIGHT

   Item

   6-8-10

4. Category

   NOT

   Item

   4-5-6

5. Category

   RIGHT

   Item

   5-12-13

6. Category

   NOT

   Item

   7-8-9

Instructions

Flip the points: do the squares check out?

Explanation