Circle Geometry Concepts

Mrs. Puñado reviews the concepts of circles, focusing on the relationship between circumference and diameter using pi. She explains how to calculate the area of a circle using the formula pi times the radius squared. Two examples are provided: one with a circle of diameter 5 and another with a radius of 11, demonstrating the calculations for both circumference and area. The video emphasizes the importance of understanding the difference between using diameter for circumference and radius for area calculations.

What is the approximate value of pi?

• 2.14

• 3.14

• 5.14

• 4.14

How is the circumference of a circle calculated?

• pi times radius

• pi times diameter

• 2 times pi times radius

• 2 times pi times diameter

What is the formula for the area of a circle?

• pi times diameter squared

• pi times radius squared

• 2 times pi times radius

• 2 times pi times diameter

If a circle has a diameter of 5, what is its circumference?

• 15.7 cm

• 10.7 cm

• 20.7 cm

• 25.7 cm

For a circle with a diameter of 5, what is the area rounded to the nearest tenth?

• 19.6 cm²

• 18.6 cm²

• 21.6 cm²

• 20.6 cm²

What is the radius of a circle if its diameter is 5?

• 10

• 5

• 7.5

• 2.5

If a circle has a radius of 11, what is its area?

• 379.9 in²

• 300.9 in²

• 400.9 in²

• 450.9 in²

What is the diameter of a circle if its radius is 11?

• 11

• 44

• 22

• 33

For a circle with a radius of 11, what is the circumference?

• 69.08 in

• 70.08 in

• 60.08 in

• 80.08 in

What is the relationship between diameter and radius?

• Diameter is half the radius

• Diameter is three times the radius

• Diameter is twice the radius

• Diameter is the same as the radius