The video tutorial explains trigonometric ratios, focusing on sine and cosine. It begins with an introduction to the purpose and approach of the lesson, followed by a detailed explanation of sine and cosine using the unit circle. The tutorial visualizes these functions and explores the concept of complementary angles, providing a comprehensive understanding of trigonometric functions and their relationships.

What is the primary trigonometric function from which others are defined?

• Sine

• Tangent

• Cosine

• Secant

What does the term 'sine' originally refer to?

• A triangle

• A circle

• A wave-like shape

• A straight line

On the unit circle, what does the y-coordinate represent?

• Secant

• Sine

• Tangent

• Cosine

How is the x-coordinate on the unit circle defined?

• Cosine

• Sine

• Cosecant

• Tangent

What is the length corresponding to sine on the unit circle?

• Horizontal distance

• Vertical distance

• Diagonal distance

• Radius

What color is used to represent sine in the visualization?

• Green

• Red

• Yellow

• Blue

What is the complementary angle of theta in a right triangle?

• 360° - Theta

• 180° - Theta

• 90° - Theta

• Theta

What does cosine represent in terms of the complementary angle?

• Opposite of the complement of theta

• Adjacent to theta

• Opposite of theta

• Hypotenuse

What is the relationship between cosine of 90° and sine?

• They are unrelated

• Cosine is the complement of sine

• Cosine is double sine

• They are equal

When do we start using the sine rule?

• In right angle triangles

• In non-right angle triangles

• In equilateral triangles

• In isosceles triangles