The wait is over! The double duty twofer Lego shapes Instructable has arrived! Learn how to make a cool inward curved edge triangle in the following steps. Step 5 will show you how to turn the triangle into a square (or diamond). Don't you just love twofers?

Note: I have no idea what the correct name for these curved edge shapes are but I'm sure there must be a name for them. I guess it's whatever the opposite of Reuleaux is but that may only apply to triangles. If you can tell me in the comments what to call these shapes then you will be my (whatever shape name) hero.

Step 1: Parts

For the triangle, you will need:
-225 1x2 bricks
-an extra pair of hands or a few extra 1x2s (for step 4)

Three colors: 75 of each color

For the square, you will need:
-300 1x2 bricks
-an extra pair of hands or a few extra 1x2s (for step 4)

Two colors: 150 of each color
Three colors: 100 of each color

Step 2:

I like making these triangles and squares because all you have to do is make a few long strips and attach them together.

Each strip is 3 rows:
25 bricks in the top row
24 bricks in the middle row
23 bricks in the bottom row

Make 3 of these beasts and you're ready for the next step.

Step 3:

Hold two strips together as shown. Use 3 bricks to attach and close up the corner.

You'll deal with the other 2 corners like this too. Go ahead and do the second corner. If you have trouble with the third corner then you're in luck because the next step is for you.

Step 4: Helping Hands

This is where it becomes very helpful to have an extra set of hands. It can be a little tricky closing this one up and if you aren't fortunate enough to have someone help you hold these bad boys together, don't despair. You can use a few extra bricks to support the corners and keep them from popping apart, just attach like shown in the picture. After you attach the final corner you can carefully remove these supports and no one will even know that you couldn't convince anyone to help you :)

Step 5: Square

To make a square, all you have to do it add another strip to the triangle. It might be easier to connect the strips in pairs and then attach those together. Oh yeah and don't forget to use a few extra bricks as supports if needed.

Wish you had more Lego shapes to build? Well you're in luck:
Lego Star
L ego Saw Blade
L ego Cog
L ego Pentagon
L ego Triangle
L ego Circle
L ego Starburst
L ego Medical Sign
Lego Heart

Also don't forget to hit that follow button so you don't miss out on the EVEN COOLER Lego shapes to come.