A googol is smaller than a billion

Every square is a rectangle

An obtuse triangle can have more than one obtuse angle.

All even numbers are composite numbers

Zero is considered an even number.

The number 1 is the smallest prime number.

The shortest distance between two points is always a straight line, regardless of the geometry of the surface.

The diagonals of a rhombus are always perpendicular bisectors of each other.

A Mobius strip is a two-dimensional object that has only one side.

The interior angles of any hexagon (a six-sided shape) always add up to 720 degrees.

In the "Monty Hall" problem (a game show with three doors), if the host opens a door to reveal a goat, switching your choice gives you a better chance of winning than staying with your original door.