What is the area of a circle with a radius of 4 cm?

Using the formula $$A = \pi r^2$$ , the area is $$A = \pi(4^2) = 16\pi \approx 50.27 cm^2$$ .

What is a semi-circle?

A semi-circle is half of a circle, formed by cutting a whole circle along its diameter.

How do you calculate the area of a semi-circle?

The area of a semi-circle is half the area of a full circle: $$A = \frac{1}{2} \pi r^2$$ .

What is the circumference of a semi-circle?

The circumference of a semi-circle is half the circumference of a full circle plus the diameter: $$C = \pi r + d$$ .

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

$$\pi$$ is approximately equal to 3.14 or can be expressed as the fraction $$\frac{22}{7}$$ .

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

The radius is half of the diameter: $$r = \frac{10}{2} = 5 cm$$ .

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

Using the formula $$C = \pi d$$ , the circumference is $$C = \pi(10) = 10\pi \approx 31.42 cm$$ .

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

Using the formula $$A = \pi r^2$$ , first find the radius: $$r = \frac{10}{2} = 5 cm$$ . Then, $$A = \pi(5^2) = 25\pi \approx 78.54 cm^2$$ .

Circles - Area and Circumference Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is a circle?

Back

A circle is a shape consisting of all points in a plane that are a fixed distance (radius) from a central point (center).

2.

FLASHCARD QUESTION

Front

What is the radius of a circle?

Back

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

3.

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 has its endpoints on the circle. It is twice the length of the radius.

Tags

CCSS.HSG.C.A.2

4.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

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 the relationship between diameter and radius?

Back

Tags

CCSS.7.G.B.4

7.

FLASHCARD QUESTION

Front

What is the circumference of a circle with a radius of 4 cm?

Back

Tags

CCSS.7.G.B.4

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