## How do you find the Quadrantal angle?

Once you have an angle θ with 0° ≤ θ ≤ 360°, you can find its reference angle as follows:

- If the terminal ray of θ lies in quadrant I, then θ ‘ = θ.
- If the terminal ray of θ lies in quadrant II, then θ ‘ = 180° − θ.
- If the terminal ray of θ lies in quadrant III, then θ ‘ = θ − 180° .

### What are the trigonometric ratios of Quadrantal angles?

The trigonometric ratios of quadrantal angles are given below.

- For θ = 00 A point (x, y) = (1, 0) lies on the terminal side of the angle θ.
- For θ = 900 A point (x, y) = (0, 1) lies on the terminal side of angle θ.
- For θ = 1800 A point (x, y) = (-1, 0) lies on the terminal side of angle θ.
- For θ = 2700

#### Is 630 a Quadrantal angle?

Trigonometry Examples The angle is between the third and fourth quadrant.

**Is 450 degrees a Quadrantal angle?**

The axes of a Cartesian coordinate plane are the boundaries of the quadrants and do not belong to any quadrant. Thus, the angular measure of 450∘ is on the + y-axis and not on any quadrant.

**Is 360 Quadrantal angle?**

An angle in standard position is called a quadrantal angle if its terminal side lies on x-axis or y-axis. Quadrantal angles include 0∘, ±90∘, ±180∘, ±270∘, ±360∘ etc.

## Is 120 degrees a Quadrantal angle?

The angle 120∘ is in the second quadrant, and its related angle is 60∘.

### What value of Cos gives 0?

Sines and cosines for special common angles

Degrees | Radians | cosine |
---|---|---|

60° | π/3 | 1/2 |

45° | π/4 | √2 / 2 |

30° | π/6 | √3 / 2 |

0° | 0 | 1 |

#### Is Cos positive quadrant 2?

In the first quadrant, the values for sin, cos and tan are positive. In the second quadrant, the values for sin are positive only. In the third quadrant, the values for tan are positive only. In the fourth quadrant, the values for cos are positive only.

**Is 120 a Quadrantal angle?**

The angle 120∘ is in the second quadrant, and its related angle is 60∘. So sin120∘=sin60∘=√32.

**Is 225 a Quadrantal angle?**

The angle is in the third quadrant.

## What are sine cosine and tangent in quadrants?

Sine, Cosine and Tangent in Four Quadrants. Sine, Cosine and Tangent. The three main functions in trigonometry are Sine, Cosine and Tangent. They are easy to calculate: Divide the length of one side of a. right angled triangle by another side. but we must know which sides!

### What is sin cos Cos and Tan?

Sine, Cosine and Tangent. Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: For a given angle θ each ratio stays the same.

#### What is the tangent of an angle in the 3rd quadrant?

The tangent of an angle in the third quadrant is positive and equal to the tangent of the same angle in the first quadrant. The cosine and sine of an angle in the third quadrant is negative and equal in magnitude, but opposite in sign, to the cosine and sine, respectively, of the same angle in the first quadrant.

**What are the trigonometric ratios of the second quadrant?**

Trigonometric ratios of angles in the second quadrant, between 90° and 180°. The cosine and tangent of an angle in the second quadrant is negative and equal in magnitude but opposite in sign to the cosine and tangent, respectively, of the same angle in the first quadrant.