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What Is a Linear Pair of Angles in Geometry?
science.howstuffworks.com/math-concepts/linear-pair.htm
In the subjects of geometry and trigonometry, a linear pair of angles is any two adjacent angles formed together to add up to 180°, or Pi radians.
How Eye Puzzles Work
entertainment.howstuffworks.com/puzzles/eye-puzzles.htm
Eye puzzles are optical illusions that, when viewed properly, can reveal hidden images. Learn how eye puzzles work at HowStuffWorks.
How KenKen Puzzles Work
entertainment.howstuffworks.com/puzzles/kenken-puzzles.htm
KenKen puzzles involve filling a number grid, with the added element of mathematical cages. Learn how KenKen puzzles work at HowStuffWorks.
Trig Identities: A Crash Course in Complex Math Concepts
science.howstuffworks.com/math-concepts/trig-identities.htm
Fundamental trigonometric identities, aka trig identities or trigo identities, are equations involving trigonometric functions that hold true for any value you substitute into their variables.
Can you ace this 5th grade math quiz?
play.howstuffworks.com/quiz/can-you-ace-this-5th-grade-math-quiz
For must of us, 5th grade was a long time ago. Mental math gets fuzzy and how to solve for X is a distant memory. But the concepts are pretty basic ... right? See if you're a math buff with our 5th grade math quiz!
Can You Answer All of These Questions About Law Enforcement?
play.howstuffworks.com/quiz/can-you-answer-all-of-these-questions-about-law-enforcement
From peacekeeping and problem solving to maintaining law and order, the duties of law enforcement officials are as varied as they are tough. Whether you've served as a police officer or have simply watched a lot of "Cops," we challenge you to answer these questions about law enforcement!
Top 30 Smartest Animals in the World
animals.howstuffworks.com/animal-facts/10-smartest-animals.htm
Humans aren't the only animals that can count, use logic, make tools or form lasting bonds with others. Meet 10 of the smartest creatures in the animal kingdom.
The Legend of Zelda Quiz
play.howstuffworks.com/quiz/legend-of-zelda
Zelda may not have been the first video game, but it required new levels of creativity and problem-solving skills to beat - not to mention plenty of home drawn maps to guide the way. See how much you know about the Zelda franchise with our quiz.
Can You Pass This Incredibly Difficult Logic Test?
play.howstuffworks.com/quiz/can-you-pass-this-incredibly-difficult-logic-test
So you think you're pretty good at solving riddles, puzzles and brain teasers, eh? It's time to really put your deduction skills to the test with this difficult logic quiz! Let's see how many you can get right!
The New York Times Crossword Puzzle Still Stumps After 80 Years
entertainment.howstuffworks.com/puzzles/new-york-times-crossword-puzzle-stumps-80-years.htm
HowStuffWorks goes inside the New York Times crossword puzzle.