Finding the Area of a Circle

The video tutorial explains how to calculate the area of a circle using the formula involving pi and the radius squared. It covers examples with both radius and diameter, emphasizing the importance of order of operations. Students are encouraged to practice calculating areas of circles and semicircles, with a focus on understanding the relationship between diameter, radius, and area. The tutorial also includes real-world applications, such as finding the area of a semicircle in the context of a protractor.

What is the formula for the area of a circle?

• 2 times pi times radius

• pi times diameter squared

• pi times radius squared

• pi times radius times diameter

If a circle has a diameter of 14 cm, what is its radius?

• 14 cm

• 3.5 cm

• 7 cm

• 28 cm

What is the area of a circle with a radius of 8 feet using pi as 3.14?

• 201.06 square feet

• 200.96 square feet

• 202.96 square feet

• 199.96 square feet

For a circle with a diameter of 42 yards, what is the area using pi as 3.14?

• 1,284.74 square yards

• 1,384.74 square yards

• 1,484.74 square yards

• 1,184.74 square yards

How do you calculate the area of a semicircle?

• pi times diameter squared

• 1/2 times pi times radius squared

• 1/2 times pi times diameter squared

• pi times radius squared

What is the radius of a semicircle with a diameter of 9 feet?

• 9 feet

• 2.25 feet

• 4.5 feet

• 18 feet

What is the area of a semicircle with a radius of 13 inches using pi as 3.14?

• 265.23 square inches

• 265.53 square inches

• 265.43 square inches

• 265.33 square inches