Posted by **Keira** on Thursday, June 25, 2009 at 9:39am.

Length of one Total # of # of

side of pattern triangular white

(in cm) Shapes used triang-

to make pattern ular

shapes

used

2 4 3

3 9 6

4 16 10

? ? ?

6 ? ?

? ? ?

? ? ?

20 ? ?

Number of gray triangular shapes used 1, 3,6,? ? ? ? ?

- Math (dont want ans just help figuring this out) -
**Reiny**, Thursday, June 25, 2009 at 10:44am
observation #1:

what happens when you square the numbers in the first column?

observation #2

in the third column:

second # - first # = ??

third # - second # = ??

observation #3

visualize billiard balls racked up

sum of balls after 1 row = 1

sum of balls after 2 rows = 3

sum of balls after 3 rows = 6

....

- Math (for Reiny) -
**Raquel**, Thursday, June 25, 2009 at 11:31am
Ok Reiny i get that i have to square the 1st row to come up with the 2nd row, but i still don't get how i come up with the 3rd row?

- Math (dont want ans just help figuring this out) -
**Damon**, Thursday, June 25, 2009 at 5:47pm
2 4 3

3 9 6

4 16 10

? ? ?

6 ? ?

? ? ?

? ? ?

20 ? ?

Third column

6-3 = 3

10-6 = 4

then

15-5 = 5

21-15 = 6

28-21 = 7

so

3

6

10

15

21

28

etc

## Answer This Question

## Related Questions

- Art - (this is vital. I need to pass this, its a big part of my grade and you ...
- Math (need more help Reiny) - Ok i figured out the first part that i need to ...
- art - this image was created by using basic math concepts that include all of ...
- elementary - Using each of the shapes in the box, draw a shape that is worth $6....
- Art - artists make shapes in the background smaller than shapes in the ...
- math - make AB pattern with two shapes.
- Algebra - Which of the following methods can be used to construct a pattern of ...
- Algebra 2 - Which of the following methods can be used to construct a pattern of...
- Art - Artists make shapes in the background smaller than shapes in the ...
- Art - Artists make shapes in the background smaller than shapes in the ...

More Related Questions