You have two red and two blue blocks. How many different towers can you build that are four blocks high using these blocks? List all the possibilities.

How many Triangles are there in each of the following figures?

Find the number of dots in the tenth figure of the following patterns.

How many Triangles are there in each of the following figures?

How many Triangles are there in each of the following figures?

Find the number of dots in the tenth figure of the following patterns.

Using the numbers from 1 to 9
(i) Can you form a magic triangle?
(ii) How many magic triangles can be formed?
(iii) What are the sums of the sides of the magic triangle?

(i) Draw the next pattern.
(ii) Prepare a table for the number of dots used for each pattern.
(iii) Explain the pattern.
(iv) Find the number of dots in the 25^th pattern.

Find the minimum number of straight lines used in forming the following figures.