Circumference and Area of a Circle

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is calculated using the formula C = 2πr, where r is the radius of the circle.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle is calculated using the formula A = πr², where r is the radius of the circle.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 10 inches, what is its circumference?

Back

Using the formula C = 2πr, the circumference is C = 2π(10) = 62.83 inches.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 5 feet, what is its area?

Back

Using the formula A = πr², the area is A = π(5)² = 78.54 square feet.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius in a circle?

Back

The diameter (d) of a circle is twice the radius (r), so d = 2r.

Tags

CCSS.7.G.B.4

Front

How do you convert the circumference from inches to yards?

Back

To convert inches to yards, divide the number of inches by 36, since there are 36 inches in a yard.

Tags

CCSS.2.MD.A.2

Front

What is the circumference of a circle with a diameter of 12 meters?

Back

Using the formula C = πd, the circumference is C = π(12) = 37.70 meters.

Tags

CCSS.7.G.B.4

Front

How do you find the radius if you know the circumference?

Back

To find the radius from the circumference, use the formula r = C/(2π).

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 3 mm?

Back

Using the formula A = πr², the area is A = π(3)² = 28.27 mm².

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 4 yards?

Back

Using the formula C = 2πr, the circumference is C = 2π(4) = 25.13 yards.

Tags

CCSS.7.G.B.4