Area of a Circle

Front

What is the formula to calculate 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.

Front

If the diameter of a circle is 50 yards, what is the radius?

Back

The radius is 25 yards, as the radius is half of the diameter.

Front

Define the term 'diameter' in relation to a circle.

Back

The diameter is a line segment that passes through the center of the circle and connects two points on its circumference.

Front

What is the area of a circle with a radius of 21 cm?

Back

The area is approximately 1384.74 cm².

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2.

Front

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

Back

The value of π (pi) is approximately 3.14 or 22/7.

Front

If a circle has a radius of 7 cm, what is its area?

Back

The area is approximately 153.94 cm², calculated using A = π(7)².

Front

What is the relationship between radius and diameter?

Back

The radius is half the length of the diameter.

Front

How do you find the area of a circle if only the diameter is given?

Back

First, divide the diameter by 2 to find the radius, then use the formula A = πr².

Front

What is the area of a circle with a radius of 5 cm?

Back

The area is approximately 78.54 cm².