Number the Sides
Look at the sets of triangles. Notice that there are missing lengths to several in each set. What is the value of the missing numbers? How can you test this to make sure you are right? Is there a pattern or rule for each set? What is the ratio for each set?
Set 1
Set 2
4
15
8
2
2
4
12
Our thinking:
Flipping the sides so they add up to the numbers on the other triangles
Our thinking:
All the sides are the same length so they must be the same number as the one shown
15
4
6
6
3
3
4
2
Our thinking:The shapes are the same but rotated around and flipped.
Sinces the numbers are going smaller they must go down
Our thinking:
The numbers just double as the shape gets bigger.