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

First, find the radius: $$r = \frac{10}{2} = 5$$ . Then, use the area formula: $$A = 3.14 \\times (5)^2 = 78.5 \\text{ in}^2$$ .

What is the total area covered by a windmill blade if the radius is 4 m?

The area covered is $$A = \\pi r^2 = 3.14 \\times (4)^2 = 50.24 \\text{ m}^2$$ .

If a circular mirror has a diameter of 12 inches, what is its area?

First, find the radius: $$r = \frac{12}{2} = 6$$ . Then, use the area formula: $$A = 3.14 \\times (6)^2 = 113.04 \\text{ in}^2$$ .

What is the first step in calculating the area of a circle?

The first step is to identify the radius of the circle.

What is the relationship between the radius and diameter of a circle?

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

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

Use the formula: $$A = \\pi r^2$$ and find the radius from the circumference using $$C = 2 \\pi r$$ .

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

Use the formula: $$A = 3.14 \\times (7)^2 = 153.86 \\text{ cm}^2$$ .

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

Use the formula: $$A = 3.14 \\times (10)^2 = 314 \\text{ m}^2$$ .

Math 6/7 Unit 6 Learning Check: Area of Circles Flashcards

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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

What is the value of π (pi) used in calculations?

Back

In calculations, π (pi) is often approximated as 3.14.

3.

FLASHCARD QUESTION

Front

How do you find the radius of a circle if you know the diameter?

Back

4.

FLASHCARD QUESTION

Front

What is the area of a semi-circle?

Back

5.

FLASHCARD QUESTION

Front

If the radius of a circle is 3 cm, what is its area using π = 3.14?

Back

6.

FLASHCARD QUESTION

Front

What does 'congruent' mean in geometry?

Back

Congruent means that two shapes are identical in shape and size.

7.

FLASHCARD QUESTION

Front

How do you calculate the area of a circle with a radius of 5 cm?

Back

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