Area and Circumference Word Problems

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.

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 or C = πd, where r is the radius and d is the diameter.

Front

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

Back

The radius (r) of a circle is half of the diameter (d). The formula is r = d/2.

Front

If the circumference of a circle is known, how can you find the area?

Back

To find the area from the circumference, first use the formula C = 2πr to find the radius (r), then use A = πr² to find the area.

Front

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

Back

The value of π (Pi) is approximately 3.14, but it can also be represented as 22/7 for some calculations.

Front

What is the area of a semi-circle?

Back

The area of a semi-circle is calculated using the formula A = (πr²)/2, where r is the radius of the semi-circle.

Front

How do you convert circumference to diameter?

Back

To convert circumference (C) to diameter (d), use the formula d = C/π.

Front

What is the circumference of a circle with a radius of 10 inches?

Back

The circumference (C) is calculated as C = 2πr = 2 * 3.14 * 10 = 62.8 inches.

Front

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

Back

The area (A) is calculated as A = πr² = 3.14 * (5)² = 78.5 square feet.

Front

How do you find the diameter if you have the area of a circle?

Back

To find the diameter from the area, first use the formula A = πr² to find the radius (r), then use d = 2r.