Calculating the Area of a Circle Using Diameter

The video tutorial explains how to calculate the area of a circle. It begins by defining the area and reviewing the parts of a circle, such as the diameter and radius. The formula for the area of a circle, A = πr², is introduced, where π is approximated as 3.14. The tutorial provides examples of calculating the area for circles with different diameters, demonstrating the step-by-step process of using the formula.

What is the term used to describe the line through the center connecting two points on the circle's boundary?

• Arc

• Radius

• Circumference

• Diameter

What is half of the diameter of a circle called?

• Circumference

• Radius

• Sector

• Segment

Which number is used as an approximation of Pi in the calculations?

• 2.718

• 3.14

• 3

• 22/7

What does the formula 'Pi * r * r' calculate?

• Area

• Volume

• Diameter

• Circumference

If the diameter of a circle is 12 cm, what is the radius?

• 3 cm

• 6 cm

• 24 cm

• 12 cm

Calculate the area of a circle with a radius of 6 cm using Pi = 3.14.

• 113.04 cm²

• 100.48 cm²

• 120.56 cm²

• 103.04 cm²

What is the radius of a circle if its diameter is 6 cm?

• 3 cm

• 6 cm

• 12 cm

• 1.5 cm

For a circle with a diameter of 9 cm, what is the radius?

• 2.25 cm

• 18 cm

• 9 cm

• 4.5 cm

What is the area of a circle with a radius of 4.5 cm using Pi = 3.14?

• 50.24 cm²

• 63.585 cm²

• 28.26 cm²

• 95.033 cm²