Find the area of a circle with a diameter of 10 inches.

First, find the radius: $$r = \\frac{10}{2} = 5 inches$$ . Then, $$A = \\pi r^2 = \\pi \\times 5^2 = 78.54 in^2$$ (approximately).

What is the relationship between diameter and radius?

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

If a circle has an area of 50.24 in², what is its radius?

Using the area formula, $$A = \\pi r^2$$ , we can solve for r: $$r = \\sqrt{\\frac{A}{\\pi}} = \\sqrt{\\frac{50.24}{\\pi}} = 4 in$$ (approximately).

What is the circumference of a circle with a diameter of 8 cm?

Using the formula $$C = \\pi d$$ , the circumference is $$C = \\pi \\times 8 = 25.13 cm$$ (approximately).

Calculate the area of a pizza with a diameter of 16 inches.

First, find the radius: $$r = \\frac{16}{2} = 8 inches$$ . Then, $$A = \\pi r^2 = \\pi \\times 8^2 = 201.06 in^2$$ (approximately).

What is the area of a circle with a radius of 6 cm?

Using the formula $$A = \\pi r^2$$ , the area is $$A = \\pi \\times 6^2 = 113.04 cm^2$$ (approximately).

If the circumference of a circle is 31.42 cm, what is its diameter?

Using the formula $$C = \\pi d$$ , we can solve for d: $$d = \\frac{C}{\\pi} = \\frac{31.42}{\\pi} = 10 cm$$ (approximately).

Resource Library

Math

Geometry

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Area And Circumference Of Circles

Area and Circumference of Circles

Flashcard

•

Mathematics

•

6th Grade

•

Practice Problem

•

Hard

•

CCSS

7.G.B.4, HSG.C.A.2, 8.EE.A.2

Standards-aligned

Wayground Content

Used 1+ times

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15 questions

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FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

What is the diameter of a circle?

Back

Tags

CCSS.HSG.C.A.2

FLASHCARD QUESTION

Front

If a circle has a radius of 5 cm, what is its diameter?

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

Calculate the area of a circle with a radius of 3 cm.

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

FLASHCARD QUESTION

Front

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

Back

Tags

CCSS.7.G.B.4

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