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 doubled, how does the area change?

Back

If the radius is doubled, the area increases by a factor of four, since area is proportional to the square of the radius.

Tags

CCSS.7.G.B.4

Front

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

Back

Using the formula A = πr², the area is A = π(7)² ≈ 153.94 cm².

Tags

CCSS.7.G.B.4

Front

How do you convert the area from square centimeters to square meters?

Back

To convert from square centimeters to square meters, divide the area in cm² by 10,000.

Tags

CCSS.5.MD.A.1

Front

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

Back

First, find the radius (5 feet), then use A = πr²: A ≈ 78.54 ft².

Tags

CCSS.7.G.B.4

Front

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

Back

The diameter is twice the radius; d = 2r.

Front

How do you find the radius if you know the area of a circle?

Back

To find the radius from the area, use the formula r = √(A/π).

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 2.5 inches?

Back

Using the formula A = π(2.5)², the area is approximately 19.63 in².

Tags

CCSS.7.G.B.4

Front

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

Back

The area of a circle is measured in square units, such as square centimeters (cm²), square meters (m²), or square feet (ft²).

Tags

CCSS.7.G.B.4