What is the cosine function

The video tutorial introduces the cosine ratio in trigonometry, emphasizing its importance alongside other trigonometric ratios. It defines cosine as the ratio of the adjacent side to the hypotenuse of a right triangle. The explanation includes a brief example to illustrate the concept, highlighting the need to understand each ratio distinctly.

What is the primary focus of the cosine ratio in trigonometry?

• It measures the angle of a triangle.

• It compares the opposite side to the hypotenuse.

• It compares the adjacent side to the hypotenuse.

• It measures the length of the hypotenuse.

Which side is used in the numerator when calculating the cosine of an angle?

• Adjacent side

• Opposite side

• Hypotenuse

• Base

Why is it important to understand different trigonometric ratios?

• They are only used in geometry.

• They are used to measure angles directly.

• Each ratio provides a unique relationship between sides of a triangle.

• They help in solving algebraic equations.

What does the cosine ratio compare in a right triangle?

• Base to height

• Adjacent side to hypotenuse

• Hypotenuse to opposite side

• Opposite side to adjacent side

In the context of trigonometry, what does the term 'adjacent' refer to?

• The base of the triangle

• The side opposite the angle

• The longest side of the triangle

• The side next to the angle