What is the definition of radian

The video tutorial explains the concept of radians, starting with a basic introduction using a circle. It describes how radians measure central angles and their relationship with the circle's radius. The tutorial further explores how many radians are in a half and full circle, introducing the concept of π radians. The video concludes by inviting viewers to ask questions for further clarification.

What is a radian primarily used to measure?

• The circumference of a circle

• The area of a circle

• The diameter of a circle

• The central angle of a circle

How many radians are there in half of a circle?

• π radians

• 4 radians

• 1 radian

• 2π radians

What is the approximate value of π radians?

• 2.71828

• 3.14159

• 1.41421

• 1.61803

How many radians are there in a full circle?

• π radians

• 3π radians

• 2π radians

• 4π radians

What should you do if you have questions about radians?

• Search online

• Ask a friend

• Comment below the video

• Ignore them