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

$$A = \\pi (7)^2 = 49\\pi \\approx 153.94 \\text{ cm}^2$$ .

What is the formula for the circumference of a circle?

$$C = 2\\pi r$$ where C is the circumference.

If the area of a circle is 314.16 cm², what is the radius?

$$r = \\sqrt{\\frac{314.16}{\\pi}} \\approx 10 \\text{ cm}$$ .

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

$$A = \\pi (3)^2 = 9\\pi \\approx 28.27 \\text{ cm}^2$$ .

What happens to the area if the radius is doubled?

The area increases by a factor of four, since $$A = \\pi (2r)^2 = 4\\pi r^2$$ .

What is the area of a circle with a radius of 1 cm?

$$A = \\pi (1)^2 = \\pi \\approx 3.14 \\text{ cm}^2$$ .

If the area of a circle is 50.27 cm², what is the approximate radius?

$$r = \\sqrt{\\frac{50.27}{\\pi}} \\approx 4 \\text{ cm}$$ .

What is the area of a circle with a radius of 2 cm?

$$A = \\pi (2)^2 = 4\\pi \\approx 12.57 \\text{ cm}^2$$ .

Area of Circles Flashcards

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Tags

CCSS.7.G.B.4

2.

FLASHCARD QUESTION

Front

What does the symbol π (pi) represent?

Back

π 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

3.

FLASHCARD QUESTION

Front

How do you calculate the radius of a circle if you know the area?

Back

Tags

CCSS.7.G.B.4

4.

FLASHCARD QUESTION

Front

What is the relationship between diameter and radius?

Back

Tags

CCSS.7.G.B.4

5.

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

6.

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

7.

FLASHCARD QUESTION

Front

How do you convert diameter to radius?

Back

Tags

CCSS.7.G.B.4

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