Finding the Area of a Circle

The video tutorial explains how to calculate the area of a circle. It begins with a brief review of the formula for the area of a circle, which is pi times the radius squared. The teacher provides examples, demonstrating how to find the area using both the exact value of pi and leaving the answer in terms of pi. The tutorial includes step-by-step calculations and emphasizes the importance of correct units. Students are encouraged to practice with additional examples, finding both the exact area and the area in terms of pi.

What is the formula for the area of a circle?

• radius squared / pi

• pi * radius squared

• 2 * pi * radius

• pi * radius

Tags

CCSS.7.G.B.4

If the diameter of a circle is 20 cm, what is the radius?

• 5 cm

• 20 cm

• 40 cm

• 10 cm

Tags

CCSS.7.G.B.4

How do you calculate the area of a circle with a radius of 7 cm?

• 21 * pi cm squared

• 7 * pi cm squared

• 14 * pi cm squared

• 49 * pi cm squared

Tags

CCSS.7.G.B.4

What units are used to measure the area of a circle?

• kilometers

• cm squared

• cm

• meters

Tags

CCSS.7.G.B.4

Calculate the area of a circle with a diameter of 10 cm.

• 78.5 cm squared

• 25 pi cm squared

• 50 pi cm squared

• 314 cm squared

Tags

CCSS.7.G.B.4

Express the area of a circle with radius 5 cm in terms of pi.

• 10 pi cm squared

• 25 pi cm squared

• 15 pi cm squared

• 5 pi cm squared

Tags

CCSS.7.G.B.4

What is the area of a circle with radius 4 cm using pi as 3.14?

• 50.2 cm squared

• 50.24 cm squared

• 12.56 cm squared

• 25.12 cm squared

Tags

CCSS.7.G.B.4

If the diameter of a circle is 10 cm, what is the area in terms of pi?

• 25 pi cm squared

• 12.5 pi cm squared

• 100 pi cm squared

• 50 pi cm squared

Tags

CCSS.7.G.B.4

What should you do after solving the area problems given in the video?

• Submit them immediately

• Check your answers twice

• Compare with a friend

• Review the video again

How many answers should you have for each problem in the final section?

• Three

• Four

• Two

• One

Tags

CCSS.1.G.A.2