Area of a Circle

Front

What is the formula for the area of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) to two decimal places?

Back

The value of π (pi) to two decimal places is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

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

Back

If the radius is 5, the area is A = π(5)² = 25π ≈ 78.54.

Tags

CCSS.7.G.B.4

Front

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

Back

The diameter is twice the length of the radius. The formula is d = 2r.

Tags

CCSS.7.G.B.4

Front

How do you convert the diameter of a circle to its radius?

Back

To convert the diameter to the radius, divide the diameter by 2. The formula is r = d/2.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a diameter of 10?

Back

The radius is 5 (10/2), so the area is A = π(5)² = 25π ≈ 78.54.

Tags

CCSS.7.G.B.4

Front

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

Back

The area is A = π(3)² = 9π ≈ 28.27.

Tags

CCSS.7.G.B.4

Front

If the area of a circle is 314.16, what is the radius?

Back

To find the radius, use the formula A = πr². Rearranging gives r = √(A/π). For A = 314.16, r ≈ 10.

Tags

CCSS.8.EE.A.2

Front

What is the area of a circle with a radius of 2?

Back

The area is A = π(2)² = 4π ≈ 12.57.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 7?

Back

The area is A = π(7)² = 49π ≈ 153.94.

Tags

CCSS.7.G.B.4