Area and Circumference of a Circle Checkpoint 1

Front

What is the formula for the area of a circle?

Back

The area of a circle is given by the formula: A = πr², where A is the area and r is the radius.

Front

What is the value of π (pi) used in calculations?

Back

The value of π (pi) is approximately 3.14.

Front

How do you calculate the area of a circle with a radius of 3 cm?

Back

Using the formula A = πr², the area is A = 3.14 * (3 cm)² = 28.26 cm².

Front

What is the formula for the circumference of a circle?

Back

The circumference of a circle is given by the formula: C = 2πr, where C is the circumference and r is the radius.

Front

How do you find the circumference of a circle with a radius of 12 m?

Back

Using the formula C = 2πr, the circumference is C = 2 * 3.14 * 12 m = 75.36 m.

Front

What is the relationship between diameter and radius?

Back

The diameter of a circle is twice the radius: Diameter = 2 * Radius.

Front

If the radius of a circle is 24 m, what is the diameter?

Back

The diameter is 48 m, calculated as Diameter = 2 * 24 m.

Front

What is the distance around a circle called?

Back

The distance around a circle is called the circumference.

Front

If a circle has a circumference of 37.68 yd, what is the radius?

Back

Using the formula C = 2πr, the radius can be found as r = C / (2π) = 37.68 yd / (2 * 3.14) = 6 yd.

Front

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

Back

First, find the radius: r = Diameter / 2 = 5 cm. Then, A = πr² = 3.14 * (5 cm)² = 78.5 cm².