Sherlock Inverted

Geometry Level 1

If the \( \color{red} { \text{red angle} } \) (ACB) is a right angle, which of the following claims is not necessarily true?

Sherlock Holmes inverted: "Once you eliminate the provably true, whatever remains, no matter how probable, must be the falsehood."

The \( \color{violet} { \text{purple angle} } \) (ACD) is a right angle The \( \color{green} { \text{green angle} } \) (ABC) is an acute angle The \( \color{blue} { \text{blue angle} } \) (BAD) is a right angle More than one of these claims is not necessarily true. The \( \color{orange} { \text{yellow angle} } \) (ADE) is an obtuse angle

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.