What is the value of $$\frac{22}{7}$$ as an approximation for $$\\pi$$ ?

$$\frac{22}{7}$$ is an approximation for $$\\pi$$ , which is approximately 3.14.

What is the relationship between diameter and radius?

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

How do you convert the radius to diameter?

To convert the radius to diameter, multiply the radius by 2: $$d = 2r$$ .

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

The area is $$A = \\pi (3)^2 = 28.26 cm^2$$ (using $$\\pi \approx 3.14$$ ).

What is the approximate value of $$\\pi$$ ?

The approximate value of $$\\pi$$ is 3.14.

If the area of a circle is 50.24 cm², what is the radius?

To find the radius, use the formula: $$r = \sqrt{\frac{A}{\\pi}} = \sqrt{\frac{50.24}{3.14}} \approx 4 cm$$ .

What is the formula for the circumference of a circle?

The formula for the circumference is $$C = \\pi d$$ or $$C = 2 \\pi r$$ .

What is the area of a circle with a diameter of 12 cm?

The radius is 6 cm, so the area is $$A = \\pi (6)^2 = 113.04 cm^2$$ (using $$\\pi \approx 3.14$$ ).

What is the term for the distance around a circle?

The term for the distance around a circle is called the circumference.

Area of a circle Flashcards

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the formula to find the area of a circle?

Back

Tags

CCSS.7.G.B.4

2.

FLASHCARD QUESTION

Front

What does the term 'radius' mean in relation to a circle?

Back

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

3.

FLASHCARD QUESTION

Front

Back

Tags

CCSS.HSG.GMD.A.1

4.

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

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

Tags

CCSS.HSG.C.A.2

5.

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

6.

FLASHCARD QUESTION

Front

What is the circumference of a circle?

Back

Tags

CCSS.7.G.B.4

7.

FLASHCARD QUESTION

Front

If the diameter of a circle is 10 cm, what is the radius?

Back

The radius is half of the diameter, so the radius is 5 cm.

Tags

CCSS.7.G.B.4

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