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# Weekly Challenge

Solve the challenge, share your solution and summit the ranks of our Community!

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## Challenge #161: Triangles, Triangles, Triangles

8 - Asteroid

@JoeM, @CharlieS

Interesting Challenge!

8 - Asteroid

My solution. Took much longer than usual to solve: I had the right picture but with 540 triangles. Had to read others' comments to come up with the right final filer.

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13 - Pulsar

Here's my solution:

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Chris
Check out my collaboration with fellow ACE Joshua Burkhow at AlterTricks.com
15 - Aurora
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Took a minute to think through how to get rid of the duplicate triangles that had all the same points but in a different order.

12 - Quasar

Fun challenge. I got 540 triangles, probably because some very thin triangles should be counted as collinear.

9 - Comet

Interesting challenge!

12 - Quasar

My solution is oh so very long and clunky, nowhere near as elegant as @TerryT 's solution...

I also went with looking at direction between the points and thus ended up with an additional 3 tiny triangles.

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8 - Asteroid

I took the non-colinear points to mean no points of the triangle share a lat/long - so I ended up with 184 unique triangles, kind of mesmerizing.

7 - Meteor
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I used "No equal degree of line" rule in ruling out col-linear dots and ended up with 535 triangles.

I suppose it's the spatial projection issue and this is within acceptance range?

14 - Magnetar

Here's my solution

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