Understanding Circles

The video tutorial explains the basic properties of a circle, including its radius and diameter. It introduces the mathematical constant pi and demonstrates how to calculate the area and circumference of a circle using the formulas pi r-squared and pi-d, respectively. The tutorial emphasizes understanding these concepts through repetition and review, ensuring learners grasp the fundamental geometry of circles.

What is the line called that extends from the center of a circle to its edge?

• Diameter

• Chord

• Radius

• Circumference

Which line passes through the center of a circle and connects two points on its boundary?

• Radius

• Chord

• Diameter

• Tangent

What formula is used to calculate the area of a circle?

• πr²

• 2πr

• πd

• 2πd

Which formula would you use to find the circumference of a circle?

• 2πr

• πd

• r²

• πr²

If you know the diameter of a circle, which formula helps you find its circumference?

• πr²

• πd

• 2πr

• r²