## The Four Quadrants

Four quadrants are used in math and other sciences. They are numbered as follows: I, II, III, and IV. The first quadrant is where the x-axis and y-axis intersect. This is also where the coordinates (0,0) are located. The quadrants are numbered in a counterclockwise direction.

### The First Quadrant

The first quadrant is located at the top right of a Cartesian coordinate plane. It is also sometimes called the upper right quadrant. The coordinates of the first quadrant are all positive values, meaning that the x-value and y-value of any point in this quadrant will be greater than 0.

### The Second Quadrant

The second quadrant, often simply called “quadrant II”, is one of the four quadrants of a Cartesian coordinate plane. It is distinguished from the others by containing only points where both coordinates are positive numbers. Points in quadrant II are sometimes referred to as being in the “top right” quadrant, due to their positions relative to the origin point (0, 0).

### The Third Quadrant

The Third Quadrant is one of the four quadrants of a coordinate plane. It contains all points whose coordinates satisfy the inequalities x < 0 and y < 0, that is, all points below and to the left of the origin (0, 0).

### The Fourth Quadrant

The fourth quadrant is the quadrant that contains 90 degrees. It is the final quadrant of a circle and is located in the upper right-hand corner when graphed on a coordinate plane. The fourth quadrant is sometimes referred to as “quadrant four” or “Q4.”

## Which Quadrant is 90 Degrees in?

It all depends on how you look at it, but most people would say that 90 degrees is in the fourth quadrant.

### The First Quadrant

All angles in the first quadrant are between 0 and 90 degrees (0°< x <90°).

The angles in the first quadrant are measured counterclockwise from the positive x-axis. A right angle is 90°, and angles less than 90° are acute angles.

### The Second Quadrant

The second quadrant of a coordinate plane is the area located in the upper right-hand corner. It is also sometimes referred to as the northeast quadrant. All points in this quadrant will have a positive x-coordinate and a negative y-coordinate.

### The Third Quadrant

The third quadrant is the one that contains angles between 270° and 360°. It is sometimes called the “top” quadrant because it is at the top of the circle if you are looking at a standard (x, y) coordinate plane. Angles in the third quadrant are measured counterclockwise from the positive x-axis.

### The Fourth Quadrant

90 degrees is in the fourth quadrant.