Circle Review

Front

What is the formula for the area of a circle?

Back

The area of a circle is given by the formula: A = πr², where A is the area and r is the radius.

Tags

CCSS.HSG.GMD.A.1

Front

What is the formula for the circumference of a circle?

Back

The circumference of a circle is given by the formula: C = 2πr or C = πd, where C is the circumference, r is the radius, and d is the diameter.

Tags

CCSS.HSG.C.B.5

CCSS.HSG.GMD.A.1

Front

If a circle has a diameter of 12 ft, what is its radius?

Back

The radius is half of the diameter. Therefore, the radius is 6 ft.

Front

Calculate the area of a circle with a radius of 6 ft.

Back

Using the formula A = πr², the area is A = π(6)² = 36π ft².

Tags

CCSS.HSG.GMD.A.1

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Tags

CCSS.HSG.C.B.5

CCSS.HSG.GMD.A.1

Front

If a circle has a circumference of 75.36 cm, what is its diameter?

Back

Using the formula C = πd, the diameter d = C/π = 75.36/3.14 = 24 cm.

Tags

CCSS.HSG.GMD.A.1

Front

What is the area of a circle with a radius of 5 cm?

Back

Using the formula A = πr², the area is A = π(5)² = 25π cm².

Tags

CCSS.HSG.GMD.A.1

Front

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

Back

Using the formula C = 2πr, the circumference is C = 2π(10) = 20π cm.

Tags

CCSS.HSG.GMD.A.1

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius. d = 2r.

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2. r = d/2.