How do you calculate the area of a circle with a given diameter?

First, find the radius by dividing the diameter by 2, then use the formula $$A = \text{π} \times r^2$$ .

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

The radius is 5 m. The area is $$A = \text{π} \times (5)^2 = 78.54 m²$$ .

If a pizza has a radius of 9.5 inches, what is its area?

Using the formula $$A = \text{π} \times r^2$$ , the area is approximately 282.74 in².

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

Using the formula $$A = \text{π} \times r^2$$ , the area is approximately 153.94 in².

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

Use the formula for circumference $$C = 2\text{π}r$$ to find the radius, then use $$A = \text{π} \times r^2$$ .

What is the area of a circle with a radius of 4.5 cm?

Using the formula $$A = \text{π} \times r^2$$ , the area is approximately 63.62 cm².

If a circle has an area of 50 cm², what is its radius?

Use the formula $$A = \text{π} \times r^2$$ . Rearranging gives $$r = \frac{\text{sqrt}(A/\text{π})}$$ , which gives approximately 3.99 cm.

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

Using the formula $$A = \text{π} \times r^2$$ , the area is approximately 19.63 m².

Area of Circle Word Problems Flashcards

Student preview

15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

2.

FLASHCARD QUESTION

Front

How do you find the radius if you know the diameter?

Back

3.

FLASHCARD QUESTION

Front

What is the area of a semicircle?

Back

4.

FLASHCARD QUESTION

Front

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

Back

5.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

6.

FLASHCARD QUESTION

Front

How do you convert the diameter to radius?

Back

7.

FLASHCARD QUESTION

Front

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

Back

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