Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is given by the formula: C = 2\pi r, where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle is given by the formula: A = \pi r^2, where r is the radius.

Tags

CCSS.7.G.B.4

Front

How do you calculate the circumference of a circle using its diameter?

Back

The circumference (C) can also be calculated using the diameter (d) with the formula: C = \pi d.

Tags

CCSS.7.G.B.4

Front

What is the area of a semi-circle with radius r?

Back

The area (A) of a semi-circle is given by the formula: A = \frac{1}{2}\pi r^2.

Tags

CCSS.7.G.B.4

Front

Calculate the circumference of a circle with a radius of 8 m. Leave your answer in terms of \pi.

Back

C = 2\pi(8) = 16\pi m.

Tags

CCSS.7.G.B.4

Front

Calculate the area of a circle with a radius of 7 cm. Leave your answer in terms of \pi.

Back

A = \pi(7^2) = 49\pi cm^2.

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 10 m, what is its circumference rounded to the nearest tenth?

Back

C = \pi(10) \approx 31.4 m.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 14 inches rounded to the nearest tenth?

Back

C = \pi(14) \approx 43.9 in.

Tags

CCSS.7.G.B.4

Front

What is the value of \pi?

Back

\pi \approx 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

What is the relationship between radius and diameter?

Back

The diameter (d) of a circle is twice the radius (r): d = 2r.