Calculating the Area of a Circle

The video tutorial explains how to find the area of a circle using the formula area = Pi * radius squared. It demonstrates the calculation with a circle of radius 9 cm, simplifying the result to 81 Pi cm². The tutorial also shows how to approximate Pi as 3.14 to find the area in numerical form, resulting in 254.34 cm².

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

• Area = radius * diameter

• Area = 2 * Pi * radius

• Area = Pi * radius squared

• Area = Pi * diameter squared

Tags

CCSS.7.G.B.4

If the radius of a circle is 9 cm, what is the area in terms of Pi?

• 9 Pi square cm

• 729 Pi square cm

• 81 Pi square cm

• 81 square cm

Tags

CCSS.7.G.B.4

What does 9 cm squared equate to?

• 81 cm squared

• 18 cm

• 81 cm

• 9 cm

Tags

CCSS.6.G.A.4

What approximate value of Pi is used in the calculations?

• 22/7

• 3.14

• 3.14159

• 2.27

Tags

CCSS.HSG.GMD.A.1

What is the final calculated area of the circle when using Pi = 3.14?

• 204.34 square cm

• 81 Pi square cm

• 254.34 cm squared

• 254.34 square cm

Tags

CCSS.7.G.B.4