If the diameter of a circle is 12, what is the radius?

If the diameter is 12, the radius is $$\frac{12}{2} = 6$$ .

What is the area of a circle with a radius of 10?

The area of a circle with a radius of 10 is $$A = π \times 10^2 = 100π \text{ or approximately } 314.16$$ .

What is the area of a circle with a diameter of 20?

The area of a circle with a diameter of 20 is $$A = π \times (10)^2 = 100π \text{ or approximately } 314.16$$ .

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

To find the area from the circumference, use the formula $$A = \frac{C^2}{4π}$$ , where C is the circumference.

What is the relationship between radius and diameter?

The relationship is that the diameter is twice the radius: $$d = 2r$$ .

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

The area of a circle with a radius of 5 is $$A = π \times 5^2 = 25π \text{ or approximately } 78.54$$ .

What is the area of a circle with a radius of 12?

The area of a circle with a radius of 12 is $$A = π \times 12^2 = 144π \text{ or approximately } 452.39$$ .

If the area of a circle is 50.27, what is the radius?

To find the radius, use the formula $$r = \frac{\text{sqrt}(A)}{π}$$ . For A = 50.27, the radius is approximately 4.

Area of Circles Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the radius of a circle?

Back

The radius of a circle is the distance from the center of the circle to any point on its circumference.

2.

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

The diameter of a circle is twice the length of the radius. It is the distance across the circle through its center.

Tags

CCSS.HSG.C.A.2

3.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle using radius?

Back

Tags

CCSS.7.G.B.4

4.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle using diameter?

Back

Tags

CCSS.7.G.B.4

5.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Tags

CCSS.7.G.B.4

6.

FLASHCARD QUESTION

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of a circle's circumference to its diameter.

Tags

CCSS.HSG.GMD.A.1

7.

FLASHCARD QUESTION

Front

If the radius of a circle is 6, what is the area?

Back

Tags

CCSS.7.G.B.4

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