Area of a circle

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the formula for the area of a circle?

Back

The area of a circle is calculated using the formula A = πr², where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle?

Back

The diameter is a line segment that passes through the center of the circle and connects two points on its circumference. It is twice the length of the radius.

Tags

CCSS.HSG.C.A.2

Front

If the radius of a circle is 9 inches, what is the area in terms of π?

Back

The area is 81π in².

Tags

CCSS.7.G.B.4

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

How do you find the area of a circle with a radius of 10 cm?

Back

Using the formula A = πr², the area is 100π cm².

Tags

CCSS.7.G.B.4

Front

What does π (pi) represent in circle calculations?

Back

π 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?

Back

The circumference is the distance around the circle, calculated using the formula C = 2πr.

Tags

CCSS.7.G.B.4

Front

If a circle has an area of 36π cm², what is its radius?

Back

The radius is 6 cm, since A = πr² implies r = √(A/π).

Tags

CCSS.7.G.B.4

Front

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

Back

The area is 16π cm², since the radius is 4 cm.

Tags

CCSS.7.G.B.4