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With over 20,000 brain teasers, riddles, logic problems, quizzes and mind puzzles submitted and ranked by users like you, Braingle has the largest collection anywhere on the internet. Our large array of unique online multiplayer games will keep you entertained for hours, and if you want to improve your brain, check out the Mentalrobics section. If you crave a brain teaser, mind puzzle, riddle or game, we are the place to get it. Increase your creativity, boost learning and become a better person at Braingle. Get ready to have your brain tangled!

Brain teasers, riddles and puzzles
Brain Teasers

Riddles, puzzles, logic problems and other enigmas to entangle the mind.

Quizzes, Tests and Trivia
Trivia

Take fun and interesting quizzes on a wide range of topics.

Brain Exercises
Mentalrobics

Daily exercises and tips for improving memory, creativity, vocabulary and stress management.

Free Multiplayer Online Games
Games

Dozens of free online games to play in your browser with other players.

Message Boards
Community

Chat with your friends in our message boards and chat rooms.


Daily Brain Teaser

Who Needs the Right Formula, Anyway?

Math
*** **

This morning I asked my math class to find the areas of two right-angled triangles. Lottie-Lu's hand shot up immediately, so I asked her the first one.

"24" she announced.

She was right (for a change!) and I made the mistake of asking her how she did it.

"Easy. Just add all the sides together."

I was about to correct her and say it was just a coincidence, when I noticed that her method worked on my second triangle as well!

Lottie-Lu must have caught my frustrated thoughts. "Well, it works, doesn't it?" she chirped.

What were the side lengths of the two triangles I had drawn on the board this morning? They were all whole numbers.

Hint
Answer


 

   

Welcome to Braingle

Braingle has tons of brain teasers, puzzles, quizzes and free online games. We also have a large vibrant community of smart people who contribute to the site in many ways. Some of the coolest features are only available to registered users. It's free to sign up, so why not give it a try?

As a Braingle user you can submit riddles, rate puzzles, make quizzes, keep track of brain teasers and play some of our exclusive games. Best of all, you'll be part of a really great community of brain teaser enthusiasts!

Sign up now!

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