Flashcard Review: Circumference of Circles

Front

What is the Circumference of a Circle?

Back

The Circumference of a Circle is the distance around the circle. It can be calculated using the formula C = 2πr, where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula to calculate the Circumference of a Circle?

Back

C = 2πr or C = πd, where r is the radius and d is the diameter.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 12 inches, what is the Circumference?

Back

C = 2π(12) ≈ 75.36 inches.

Tags

CCSS.7.G.B.4

Front

What does 'π' represent in the context of circles?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Tags

CCSS.HSG.GMD.A.1

Front

What is the Circumference of a Circle with a diameter of 10 feet?

Back

C = πd = π(10) ≈ 31.4 feet.

Tags

CCSS.7.G.B.4

Front

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

Back

You can find the diameter using the formula d = C/π.

Tags

CCSS.7.G.B.4

Front

What is the Circumference of a Circle with a radius of 7 yards?

Back

C = 2π(7) ≈ 43.96 yards.

Tags

CCSS.7.G.B.4

Front

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

Back

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

Front

If a circle has a Circumference of 96 cm, what is its radius?

Back

r = C/(2π) = 96/(2π) ≈ 15.3 cm.

Tags

CCSS.7.G.B.4

Front

What is the Circumference of a Circle with a radius of 15 cm?

Back

C = 2π(15) ≈ 94.25 cm.

Tags

CCSS.7.G.B.4